Haskell Indian Nations University (Haskell or HINU) is a public tribal land-grant university in Lawrence, Kansas, United States. Founded in 1884 as a residential boarding school for Native American children, the school has developed into a university operated by the U.S. Bureau of Indian Affairs that offers both associate and baccalaureate degrees. The college was founded to serve members of federally recognized Native American tribes in the United States. It is the oldest continually operating federal school for American Indians.

Approximately 140 Tribal nations and Alaska Native communities are represented at Haskell, which is funded directly by the Bureau of Indian Education as a U.S. Trust Responsibility to Native American Tribes. While the school does not charge tuition, students are responsible for paying yearly fees.

Twelve campus buildings have been designated as U.S. National Historic Landmarks. Haskell is home to the Haskell Cultural Center and Museum, the American Indian Athletic Hall of Fame, the Indian Leader, the oldest Native American student newspaper in the country; and numerous student clubs and organizations. Faculty and students built the Haskell Medicine Wheel Earthwork in 1992, and the Haskell-Baker Wetlands are important for migrating birds. The renowned Rinehart Collection is housed in the Haskell Cultural Center. Numerous sculptures and murals are located throughout the campus. Haskell also is a member of the American Council on Education, the Council for Higher Education Accreditation, the Higher Learning Commission, and the National Association of Intercollegiate Athletics.

The university hosts cultural and academic events that attract visitors (both Native American and non-Native) from across the country and abroad. Such events include the annual Haskell Indian Art Market, the Stories-n-Motion Film Festival, and the Haskell Commencement and Pow-Wow. These public events are held along with numerous educational conferences, workshops, and presentations.

The history of Haskell Indian Nations University reflects both U.S. Indian policy and self-determination efforts by American Indian and Alaska Native communities. Haskell was founded during an era following the Indian Wars when the federal government believed that Native Americans needed to assimilate into the majority culture in order to survive. The US government had earlier provided some schools on reservations according to treaties, which were usually administered by religious missions. In the late 19th century, it also began to establish off-reservation boarding schools. Native American children were recruited from a variety of tribes to attend for their education, and were expected to abandon their tribal traditions while there. The Carlisle Indian Industrial School, founded in 1879 in Pennsylvania, became the model for federal immersion programs in education. In 1882 the United States Congress authorized three new boarding schools to be established in Nebraska, Kansas, and Indian Territory (a plan that would cost $150,000), and the Carlisle school was the model for these soon-to-be-constructed institutions, including what became Haskell in Kansas.

When Haskell opened in 1884, it was called "United States Indian Industrial Training School". It had 22 elementary school-age students the first year. Soon boys were taught skills in tailoring, wagon making, blacksmithing, harness making, painting, shoe making, and farming, reflecting trades common to their mostly rural and small town environments of reservations. Girls studied cooking, sewing and homemaking. As was typical of many such rural schools, most of the students' food was produced on the associated Haskell farm. Older students were expected to work while at the school, as in the model of Tuskegee Institute and similar independent institutions.

According to many sources, school living conditions during the 1880s and 1890s were harsh. Organized under the semi-military system of the Carlisle Indian School, students wore uniforms to enforce conformity and end tribal identification. Their hair was cut when they entered school, which was especially painful for the boys, as in most tribes, adult men kept long hair. The children marched to classes and exercised regularly. Students were often physically punished if they failed to follow the rules of the institute. At least 103 children died while attending the school.

In 1887, the school was renamed "Haskell Institute" in honor of Dudley Haskell, the U.S. representative from Kansas's 2nd district who achieved having the school built in Lawrence.