Statehood Day or Admission Day is a legal holiday in the state of Hawaiʻi in the United States. It is celebrated annually on the third Friday in August to commemorate the anniversary of the state's 1959 admission to the Union. It was first celebrated in 1969.

Statehood bills for Hawaiʻi were introduced into the U.S. Congress as early as 1919 by Prince Jonah Kūhiō Kalanianaʻole, the non-voting delegate sent by the Territory of Hawaiʻi to the U.S. Congress. Additional bills were introduced in 1935, 1947 and 1950. In 1959, the U.S. Congress approved the statehood bill, the Hawaiʻi Admission Act.