A Pell Grant is a subsidy the U.S. federal government provides for students who need it to pay for college. Federal Pell Grants are limited to students with exceptional financial need, who have not earned their first bachelor's degree, or who are enrolled in certain post-baccalaureate programs, through participating institutions. Originally known as a Basic Educational Opportunity Grant, it was renamed in 1980 in honor of Democratic U.S. Senator Claiborne Pell of Rhode Island to honor his central role in creating the program. A Pell Grant is generally considered the foundation of a student's financial aid package, to which other forms of aid are added. The Federal Pell Grant program is administered by the United States Department of Education, which determines the student's financial need and through it, the student's Pell eligibility. The U.S. Department of Education uses a standard formula to evaluate financial information reported on the Free Application for Federal Student Aid (FAFSA) for determining the student's Expected Family Contribution (EFC).

Pell Grants were created by the Higher Education Act of 1965. These federal funded grants are not loans, and need not be repaid. Students may use their grants at any one of approximately 5,400 participating postsecondary institutions. These federally funded grants help about 5.4 million full-time and part-time college and vocational school students nationally. As of the 2017–2018 academic year, the top three funded universities by total grant money were CUNY ($638 million), SUNY ($323 million), and the University of Phoenix ($197 million); three of the top ten funded colleges were for-profit colleges.

Today, the Pell Grant program assists undergraduates of low-income families, who are actively attending universities and or other secondary institutions. However, before the Pell Grant became what it is today, it went through numerous changes.

In 1965, Congress passed the Higher Education Act of 1965 (HEA). President Lyndon B. Johnson implemented the HEA as a part of his administration's agenda to assist and improve higher education in the United States. It was the initial legislation to benefit lower- and middle-income students. The HEA program included not only grants but also low-interest loans to students who did not qualify for grants. Universities and other institutions, such as vocational schools, benefited as well from the HEA program, by receiving federal aid to improve the quality of the education process. Student aid programs administered by the US Department of Education are contained in Title IV of the HEA and so are called "Title IV Programs."

In 1972, Title IX Higher Education Amendments were a response to the distribution of aid in the current grant. Senator Claiborne Pell set forth the initial movements to reform the HEA. Lois Rice, an American corporate executive, scholar and education policy expert is known as the "mother of the Pell Grant" for her work lobbying for its creation. The Opportunity Grant Program (Basic Grant) was intended to serve as the "floor" or "foundation" of an undergraduate student's financial aid package. Other financial aid, to the extent that it was available, would be added to the Basic Grant up to the limit of a student's financial need. Most changes to the federal student aid program result from a process called reauthorization. Through the process of reauthorization, Congress examines the status of each program and decides whether to continue that program and whether a continued program requires changes in structure or purpose. Congress has reauthorized campus-based programs every five or six years, beginning in 1972.

In 1994, Congress passed the Violent Crime Control and Law Enforcement Act (VCCLEA), a provision of which revoked Pell Grant funding "to any individual who is incarcerated in any federal or state penal institution." A provision of this Act overturned a section of the Higher Education Act of 1965, which created the Pell Grant for postsecondary education. The provision reads, "No basic grant shall be awarded under this subpart to any individual who is incarcerated in any Federal or State penal institution." Prisoners first became eligible for basic grant funding in 1972. As the principal design of the Pell Grant was to help low-income individuals attain post-secondary education, including prisoners was consistent with the goal. The grant aimed to reach those who might not otherwise have an opportunity to enroll in college study or vocational training programs. Including prisoners for funding was based on the notion that higher education improved the lives of inmates, reduced recidivism, and contributed to a more orderly institution.

There has been some advocacy for reinstating Pell Grant funding for all prisoners who would qualify, despite their incarceration status, by members of the House of Representatives who introduced the Restoring Education and Learning Act (REAL Act) in the spring of 2014. At the executive level, the Obama administration backed a program at the Department of Education that would have allowed for a limited lifting of the ban for some prisoners called the Second Chance Pell Pilot.

The ban was lifted by the Consolidated Appropriations Act, 2021.