| Onesin Cvitan | |
| Office: | Minister of the Interior |
| Term Start: | 2 July 1991 |
| Term End: | 17 July 1991 |
| Primeminister: | Josip Manolić |
| Predecessor: | Josip Boljkovac |
| Successor: | Ivan Vekić |
| Order2: | 62nd |
| Office2: | Mayor of Split |
| Term Start2: | 1990 |
| Term End2: | 1991 |
| Predecessor2: | Gordana Kosanović |
| Successor2: | Petar Slapničar |
| Birth Date: | 16 February 1939 |
| Birth Place: | Tribunj, Kingdom of Yugoslavia |
| Party: | Croatian Democratic Union |
| Alma Mater: | University of Zagreb University of Split |
| Occupation: | Lawyer |
Onesin Cvitan (born 16 February 1939) is a Croatian jurist and politician. He briefly served as interior minister in the Cabinet of Josip Manolić in July 1991, during the early stages of the 1991–95 Croatian War of Independence.
Born in the town of Tribunj on the Dalmatian coast, Cvitan was schooled in Korčula, Split and Zagreb. He graduated from the University of Zagreb's Faculty of Law in 1970, and earned his doctorate at the University of Split in 1977.
Before serving as interior minister he was Mayor of Split from 1990 to 1991. In 1992 he was appointed Croatia's ambassador to Ukraine, and from 1995 to 1997 he was ambassador to Macedonia. In 1997 he returned to teach at the University of Split Law School.