If you want to work as a professional librarian — in a public library, academic institution, school, or special library — a master's degree in library science (MLS) or library and information science (MLIS) is the standard credential required for most professional-level positions. The degree prepares you for the information management, research support, community programming, and technical work that defines modern librarianship.
This guide covers what MLS programs actually teach, why ALA accreditation matters, how online programs compare to on-campus options, and what careers become available after you graduate.
The curriculum varies by program, but most ALA-accredited MLS programs cover a common core of competencies:
Most programs allow (and many encourage) specialization. Common tracks include:
Your choice of specialization should align with where you want to work. School librarian positions typically require the school library specialization plus state teacher certification. Medical librarian roles benefit from health sciences specialization. For most public and academic library positions, a general MLS with relevant experience works fine.
The American Library Association (ALA) accredits graduate library programs in the US and Canada. ALA accreditation is the single most important credential quality marker you should look for when choosing a program.
Many professional librarian positions — particularly in public libraries, academic institutions, and school systems — require or strongly prefer an ALA-accredited degree as a hiring condition. Some state library certification systems require ALA-accredited degrees explicitly. Graduating from a non-accredited program can disqualify you from the positions you're preparing for.
There are currently about 65 ALA-accredited programs in the US. This includes programs at public universities, private universities, and several fully online options. ALA maintains a current list on their website at ala.org. Always verify a program's accreditation status before applying — accreditation can lapse, and a program that was accredited years ago may no longer be.
The library science field has embraced online education more thoroughly than most graduate disciplines. The majority of ALA-accredited programs now offer fully online or hybrid options. This is a significant practical advantage for career changers and working adults.
Programs like those offered by San Jose State University (iSchool), University of Illinois Urbana-Champaign, Simmons University, and University of Kentucky have strong reputations and are 100% online. These programs deliver the same ALA-accredited curriculum as on-campus versions. For most career goals, an online ALA-accredited degree is equivalent to an on-campus one.
The practical benefits of online MLS programs are substantial. You can work full-time while completing the degree (most students do). You're not geographically restricted to programs near your home. And many programs can be completed in 2–3 years part-time.
The limitation: field experience. On-campus programs often have stronger built-in connections to practicum placements and local library networks. Online students need to be more proactive about building these connections — arranging their own practicums and networking with professional associations.
Traditional on-campus programs at institutions like University of Washington, Pratt Institute, Rutgers, and Indiana University offer full-time immersive experiences, richer in-person networking, and often stronger placement services. If you can attend full-time and the geographic and financial conditions are right, on-campus programs are excellent.
The tradeoff is obvious: you can't work full-time and attend a full-time on-campus program simultaneously. You're tied to a specific location. And the cost difference matters — on-campus programs often have higher fees.
Costs vary considerably. In-state tuition at public university programs typically runs $15,000–$30,000 total for the degree. Out-of-state can run $25,000–$45,000. Private university programs vary widely but often cost $40,000–$65,000.
Graduate assistantships are available at many full-time programs — these provide tuition waivers and stipends in exchange for research or teaching support work. If attending a residential program, GA positions can substantially reduce costs.
Federal student loans and PSLF (Public Service Loan Forgiveness) are relevant for most library science students since many positions are in government or nonprofit settings — public libraries, school systems, and public universities all qualify for PSLF. If you're taking out loans, understanding PSLF eligibility is worth doing before choosing a job sector after graduation.
Full-time enrollment: most programs take 1.5–2 years. Part-time enrollment: typically 3–4 years. Some programs offer an accelerated option that compresses coursework if you can handle a heavier credit load.
Credit requirements vary by program but most fall in the range of 36–42 credit hours. Programs with a thesis track (less common) may require additional credits and a thesis project.
Field experience requirements — practicums or internships — are common. Many programs require 120–200 hours of supervised library experience as part of the degree. If you're already working in a library (as a library aide, paraprofessional, or assistant), this may count toward your practicum depending on the program's policies.
There's no single definitive ranking, and the "best" program depends heavily on your specialization goals, budget, and geographic flexibility. But here's what distinguishes stronger programs from weaker ones:
Well-regarded programs include: University of Illinois Urbana-Champaign, University of Michigan, University of North Carolina Chapel Hill, Simmons University, San Jose State University (for online), Syracuse University, Indiana University, and Pratt Institute. But a strong mid-tier program close to your target job market can outperform a highly ranked distant one for placement purposes.
An MLS opens multiple career paths. Librarianship is a diverse field — not just the public library reference desk image many people default to.
The most common path. Public librarians work in community library systems, managing collections, providing reference services, developing programs (especially for children, teens, and adults), and often managing branch facilities. Department head and director positions require the degree and experience.
Academic librarians work in college and university libraries. Roles include reference and instruction librarian (teaching research skills and database use to students and faculty), subject librarian (supporting specific academic departments), cataloger, digital services librarian, and library administrator. Most academic library positions require the ALA-accredited MLS.
School library positions typically require both an MLS and state teacher certification. Requirements vary by state — some require both; some allow MLS-only; some have specific school library certification programs. Research your target state's requirements before choosing your program.
Special libraries serve specific organizational needs: law firms (law libraries), hospitals (medical libraries), corporations (corporate intelligence and research), government agencies, museums, and nonprofits. These positions often pay significantly more than public library positions and benefit from domain expertise in addition to the MLS.
Archives work — managing historical records, manuscripts, and primary source collections — is a closely related field often housed in MLS programs. An archives specialization or a separate archival studies track prepares students for archival positions. The Society of American Archivists offers the Certified Archivist (CA) credential for post-degree professional certification.