James R. "Duke" Aiona Jr. (born June 8, 1955) is an American politician and jurist who served as the eleventh lieutenant governor of Hawaii under Linda Lingle from 2002 to 2010.

In June 2022, Aiona announced that he would run again for a third time in the Republican nomination for the 2022 election, which he lost to Democrat Josh Green, the incumbent Hawaii Lieutenant Governor.

Upon graduating high school, Aiona played basketball at University of the Pacific in Stockton, California and pursued a bachelor of arts degree in political science, which he received from there in 1977.

[2] He began his legal career at the City and County of Honolulu as a deputy prosecutor, and was appointed to the Hawaiʻi State Judiciary in 1990 as a Family Court judge.

[3] Aiona and Governor Linda Lingle became Hawaii's first Republican administration to win a second term, and they won with the largest margin of victory in any gubernatorial race in the history of the state.