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Compare curriculum, accreditation, careers, and outcomes to choose the right library master's degree
If you are researching graduate programs in librarianship, you have probably noticed two acronyms competing for your attention: MLS and MLIS. Are they actually different degrees, or just different names for the same credential?
The short answer: when both are accredited by the American Library Association, they are treated as equivalent for librarian hiring and licensure. The longer answer involves curriculum emphasis, where MLIS degrees tend to weight technology and information science more heavily.
Below, we compare the two degrees on admissions, cost, duration, career paths, and salary, then walk through how to choose a concentration for a library science program that fits your goals.
Both degrees prepare graduates for professional librarian and information roles, and when accredited by the American Library Association (ALA) they are treated as equivalent by employers. The main differences come down to naming conventions and curricular emphasis, with MLIS now the more common label across U.S. programs in 2025-2026.
| Factor | Master's in Library Science (MLS) | Master's in Library & Information Science (MLIS) |
|---|---|---|
| Full degree name | Master of Library Science | Master of Library and Information Science |
| Prevalence in 2025-2026 | Less common; retained by a minority of programs and some long-standing schools | Dominant naming convention used by most ALA-accredited programs today |
| Typical curriculum focus | Cataloging, collection development, reference services, library administration, and traditional library operations | Same library core plus added emphasis on information technology, data management, user experience, and digital systems |
| Accreditation | Can be ALA-accredited; equivalent professional standing when accredited | Can be ALA-accredited; equivalent professional standing when accredited |
| Typical length | About 36 credit hours, generally 1.5 to 2 years full-time | About 36 to 42 credit hours, generally 1.5 to 2 years full-time |
| Format availability | Offered on-campus and online at select schools | Widely offered online, on-campus, and in hybrid formats |
| Common career outcomes | Public, academic, school, and special librarians; archivists; library administrators | Same librarian roles plus information architect, data librarian, digital asset manager, and metadata specialist positions |
| Recognition for librarian roles | Accepted for positions requiring an ALA-accredited master's degree | Accepted for positions requiring an ALA-accredited master's degree |
The Master of Library Science (MLS) is the original professional credential for librarians in the United States. It traces its roots to the early 20th century, when Melvil Dewey founded the first library school at Columbia in 1887 and the field gradually professionalized through the 1920s and 1930s. By mid-century, the MLS had become the standard graduate degree expected for academic, public, and school library positions, and the American Library Association (ALA) began accrediting programs to ensure consistent professional preparation.
A classic MLS curriculum is built around the core competencies of running a library. Students typically take coursework in:
The emphasis is squarely on libraries as institutions and on the practical skills needed to manage their collections, services, and staff. For a closer look at the competencies cultivated in these programs, see our overview of what you learn in a library science degree.
Fewer schools still use the 'MLS' label today. Beginning in the 1980s and accelerating through the 2000s, most programs rebranded their degrees to 'Master of Library and Information Science' (MLIS) or similar titles to reflect the growing role of digital information, data management, and technology in the field. As a result, many universities now offer what is functionally the same accredited library science graduate degree under a different name.
A handful of well known programs continue to award the MLS title, including Indiana University Bloomington and Texas Woman's University. When a current program still uses 'MLS,' it generally signals continuity with the traditional library focused curriculum rather than a meaningfully different credential.
A Master's in Library & Information Science (MLIS) is a graduate degree that prepares students for professional roles in libraries, archives, and a growing range of information-focused workplaces. The acronym MLIS stands for Master of Library and Information Science (some programs also use Master of Library and Information Studies). It typically takes one and a half to two years of full-time study, or longer part-time, and is offered both on-campus and fully online.
The MLIS keeps the traditional library curriculum (cataloging, reference, collection development, services to specific user groups) and layers on coursework that reflects how information is created, stored, and retrieved today. Common additions include:
This broader scope is why MLIS graduates are increasingly hired outside traditional libraries, in tech companies, government agencies, museums, hospitals, law firms, and corporate knowledge management teams. The range of careers in library science now spans well beyond the reference desk.
Starting in the 1990s and accelerating through the 2000s, most graduate library schools renamed their degrees to add 'Information' to the title. The shift mirrored what the field was actually doing: as card catalogs became online catalogs, as collections went digital, and as the internet reshaped how people find information, programs absorbed coursework from computer science, communications, and human-computer interaction. Renaming the degree signaled to employers and applicants that graduates were trained for digital and data-driven work, not just print stacks.
Today, MLIS is the more common name for the degree. The majority of ALA-accredited MLIS online programs in the United States and Canada award an MLIS (or a closely related title such as MIS or MI), and most employer postings for librarian positions list MLIS as the expected credential.
The American Library Association is unambiguous: any master's degree earned from an ALA-accredited program qualifies a graduate as a professional librarian, regardless of what the diploma is called.1 That includes the MLS, MLIS, Master of Library and Information Studies, Master of Information Studies, Master of Arts, Master of Librarianship, and Master of Science. The accrediting body evaluates programs against its Standards for Accreditation of Master's Programs in Library and Information Studies, not against the name a university chooses to print on the credential. Each program decides its own degree title, which is why two graduates with virtually identical coursework may walk away with different letters after their names.
For the 2025-2026 academic year, the ALA's Office for Accreditation lists 59 accredited master's programs across North America.2 Of those, 55 are based in the United States (including Puerto Rico) and 4 are in Canada, offered by the University of Alberta, the University of British Columbia, McGill University, and the University of Toronto. This count reflects fully accredited programs only; candidate programs (those still working toward initial accreditation) are not included in the total.
This is where the choice of program matters far more than the choice of degree title. Many academic libraries, public library systems, and state school librarian licensure boards explicitly require a master's from an ALA accredited program. A degree from a non-accredited program, even one with a similar curriculum, may not meet hiring standards or state certification rules for K-12 school librarians. Applicants can find themselves locked out of the very jobs the degree was meant to open.
In practice, hiring managers in libraries do not parse MLS versus MLIS as meaningfully different credentials. Job postings typically read "ALA-accredited master's degree required" or "MLS/MLIS from an ALA-accredited program." The accreditation stamp is the qualifier; the specific name on the diploma is not.
Admission requirements for MLS and MLIS programs are remarkably similar, since most are housed in the same iSchools or library science departments. The degree name on the diploma rarely changes what admissions committees ask for. That said, requirements shift year to year, so the rule is simple: verify directly with each program before you apply.
The American Library Association maintains the authoritative list of accredited programs at ala.org. Start there. Each entry links out to the school's official admissions page, which is the only source you should treat as binding. Program brochures, third-party rankings, and even older blog posts (including this one, eventually) can fall out of date within a single admissions cycle.
For general career and salary context, the ALA and the U.S. Bureau of Labor Statistics (bls.gov) are reliable. For application specifics, only the program's own page counts.
While every school sets its own bar, a few patterns recur at well-known programs such as the University of Illinois iSchool, UNC Chapel Hill, the University of Washington Information School, Rutgers, and Syracuse:
Because GRE policies have shifted so quickly, it's worth knowing which schools have moved to MLS no GRE admissions before you spend time on test prep. Confirm the current GRE policy, application deadlines, residency or in-state tuition rules, and whether any prerequisite coursework (such as a research methods or technology course) is expected. A ten-minute check on each program's admissions page can save you from submitting materials a school no longer requires, or missing one it quietly added.
Cost is often the deciding factor between otherwise comparable MLS and MLIS programs. Because the ALA accredits both degree titles to the same standard, the price tag reflects the institution, not the credential.
At the affordable end of online ALA-accredited programs, several public universities keep total program costs under $12,000:1
For a fuller comparison, our roundup of affordable library science degree online options breaks down per-credit pricing across public programs. Mid-range and premium programs run substantially higher. San Jose State University's MLIS comes to roughly $24,400 total at $568 per credit. Private and flagship research programs sit at the top: the University of Washington iSchool MLIS runs $40,000 to $50,000, and the University of Denver's online MLIS lands near $50,000 ($1,200 per credit).2
Most online ALA-accredited programs require 36 to 39 credit hours and can be completed in about 24 months of full-time study.3 Some programs stretch to 42 or 43 credits (San Jose State, Denver), and Washington's iSchool requires 63 credits. Part-time students typically finish in three to four years, which is common since most enrollees are already working. Students prioritizing speed can review the fastest library science degree paths to compare accelerated timelines.
The online format is now the norm rather than the exception. The majority of ALA-accredited programs offer fully online or hybrid tracks, allowing students to keep their jobs and avoid relocating. The trade-off is real, though: on-campus students often have easier access to in-person practicums, faculty research assistantships, and informal networking with peers and local library systems. Online programs increasingly counter this through virtual residencies, regional practicum placements, and active student communities, but candidates who learn best through face-to-face mentorship should weigh that preference carefully.
Whether you earn an MLS or an MLIS, employers and salary surveys treat the two credentials interchangeably as long as the program is ALA-accredited. That means your earning potential is shaped less by the letters on your diploma and more by the sector you enter, your specialization, and the region where you work. Here is how to research realistic salary ranges for the roles you are considering.
The U.S. Bureau of Labor Statistics Occupational Outlook Handbook is the most reliable starting point. Search for "Librarians and Library Media Specialists" (SOC code 25-4022) to find the current national library science salary, the 90th percentile figure, and projected job growth over the next decade. The Handbook also breaks earnings out by industry, which matters: librarians working for the federal government and in professional, scientific, and technical services typically earn well above the overall median, while those in local government and elementary or secondary schools tend to earn less.
For specialized roles, association surveys give you sharper numbers than general wage data:
Numbers on paper are useful, but live job postings tell you what employers are actually offering right now. Browse ALA JobLIST, INALJ, HigherEdJobs, and LinkedIn for library science jobs that match your target role, then cross-check posted salary bands with Glassdoor and Payscale entries from current employees. Many ALA-accredited programs also publish alumni outcome reports listing job titles, employers, and starting salaries; ask the admissions office for the most recent placement data before you enroll.
Six-figure roles do exist in this field, but they generally require five or more years of experience plus a specialization. Variation by region also matters, so it pays to check masters in library science salary data for your state. Library directors at large public or academic systems, law firm librarians in major metro markets, federal agency librarians at higher GS grades, information architects, taxonomists, and competitive intelligence analysts in corporate settings are the most common paths to that tier.
Here is the honest guidance for 2026: the decision is almost never MLS versus MLIS. It is a decision between specific ALA-accredited programs that happen to use one name or the other. Once you understand that, the choice becomes much simpler.
When comparing programs, weigh these in order:
If you are headed toward tech-adjacent roles such as data librarianship, digital asset management, UX research in libraries, or knowledge management in industry, prioritize MLIS programs with strong information science tracks: courses in metadata, data curation, database design, and information architecture. A focused online library science degree with digital curation focus can be a smart fit here.
If you are headed toward public libraries, school media centers, academic reference, archives, or youth services, prioritize programs (MLS or MLIS) with depth in cataloging, collection development, reference services, children's and young adult literature, and archival theory. Practicum and internship opportunities in your target setting matter more here than the degree name on the transcript.
Before you submit a single application, walk through how to choose a library science program and open the ALA Office for Accreditation directory to confirm that every program on your shortlist is currently accredited. That one check protects your tuition investment and keeps every librarian career path open to you.
Prospective students often ask the same handful of questions when weighing an MLS against an MLIS. The short answers below cover accreditation, salary potential, licensure, and what each acronym actually means.
