A Master of Library and Information Science (MLIS) is the standard professional credential for librarianship and a growing range of information-focused roles — archives, data curation, UX research, and records management among them. If you assumed this degree is purely about running a library, the field has moved considerably further than that in recent years.
What Is an MLIS Degree?
An MLIS is a professional graduate degree that trains people to organize, manage, preserve, and provide access to information — in physical collections, digital systems, or both. It's overwhelmingly a master's-level field: standalone undergraduate library science majors are rare, and most people enter the profession by completing an unrelated bachelor's degree first, then pursuing the MLIS (or an equivalently named master's — some schools call it an MLS, MSIS, or MIS) as the entry-level professional credential.
ALA Accreditation Is the Key Quality Signal
In the US and Canada, the American Library Association (ALA) accredits master's programs in library and information science against defined professional standards, and ALA accreditation is the single most checkable quality signal in the field. Many library jobs — especially public and academic library positions — explicitly require a degree from an ALA-accredited program as a condition of employment, making accreditation status more decision-relevant here than in many other graduate fields. Outside North America, look for the equivalent recognized professional body (such as CILIP in the UK) and check whether your target employer or country requires program accreditation at all, since requirements vary more by country in this field than in most others.
Typical Structure and Duration
| Element | Typical Range |
|---|---|
| Duration (full-time) | Roughly 1.5–2 years |
| Duration (part-time/online) | 2–4 years |
| Credit hours | Roughly 36–48 credits, varying by program |
| Format | Widely offered online, hybrid, and on-campus — online MLIS programs are common and generally well-accepted given the field's accreditation-driven quality signal |
| Practicum/internship | Many programs include or strongly encourage a supervised practicum or internship in a library, archive, or information-focused organization |
| Culminating project | Varies by program — capstone project, portfolio, or (less commonly) a thesis |
| Typical entry requirement | A bachelor's degree in any field; no specific undergraduate major is required |
| Common specializations | Archives and records management, academic/public/school librarianship, data curation and information management, UX research and design, digital humanities |
Typical Cost
Cost varies by institution type, format, and specialization:
- Public/state universities tend to be the most affordable, particularly for in-state or resident-tuition students.
- Private universities, including well-known iSchools, are typically more expensive.
- Online MLIS programs have become widely available and are generally well-regarded in this field given the emphasis on ALA accreditation over campus prestige, which can reduce costs and open access for working professionals or those relocating for a library role after graduation.
- Some students combine tuition with graduate assistantships within their own university's library system, which are relatively common in this field compared to others.
These are rough, general ranges — actual cost depends heavily on the specific university, format, and residency status, so treat any figure here as a starting point for research rather than a firm estimate.
Career Outcomes
MLIS graduates have broadened well beyond traditional librarianship into a range of information-focused roles:
- Public and academic librarianship — the traditional core of the field, still a major outcome for many graduates, spanning reference, instruction, collection development, and administration
- School librarianship — often requiring additional state teaching-credential requirements alongside the MLIS, depending on the state and school system
- Archives and records management — preserving and providing access to historical, institutional, or organizational records, often requiring specialized archival coursework
- Data curation and information management — organizing and managing research data, metadata, and digital collections for universities, research institutions, and corporations
- UX research and design — the field's information-organization and user-needs-analysis training transfers directly to UX roles, an increasingly common destination for MLIS graduates, particularly from programs with strong information science tracks
- Corporate and special libraries — information roles within law firms, corporations, museums, and government agencies
The breadth of this field means outcomes vary significantly by concentration — a traditional public-librarianship track leads somewhere quite different from a data curation or UX-focused track, so it's worth choosing coursework and internships with a specific target role in mind.
Who It's For (and Who It's Not For)
An MLIS is generally a good fit if:
- You're interested in organizing, preserving, or providing access to information, whether in a traditional library setting or an adjacent field like archives, data, or UX
- You want a professional credential that's flexible across sectors — public, academic, corporate, government, and nonprofit organizations all employ MLIS graduates
- You're planning ahead as an undergraduate and want to choose a related bachelor's (English, history, computer science, information systems) with the MLIS as a graduate-school decision later
A different degree might serve you better if:
- Your interest is purely in software/data engineering rather than information organization and access — a computer science or data science degree is likely the closer fit
- You want a research-focused academic career studying information science itself rather than professional practice — a PhD in information science is the more relevant next step after (or sometimes instead of) an MLIS
For school-specific research, see our guide to the best universities for library and information science.