Colin Rafferty Marie Jude Bonini (born April 14, 1965) is an American politician and a Republican former member of the Delaware Senate, where he represented the 16th District from 1994 to 2022.

Bonini received his Bachelor of Arts from Wesley College in 1991. He received a Master of Public Administration from the University of Delaware in 1999.^[1][2] While in college, he worked for United States Senator Bill Roth and the United States Department of State in New Delhi, India.^{[citation needed]}

He was elected in 1994 to represent the 16th District in the Delaware Senate.^[3] The district covers part of southern and eastern Kent County along with a small portion of adjacent Sussex County. It includes the southern portions of Dover around the Dover Air Force Base and the towns of Frederica and Harrington.^{[citation needed]}

In 2010, Bonini unsuccessfully ran for state treasurer, losing to Democrat Chip Flowers. Flowers received 51 percent of the vote to defeat Bonini by 6,121 votes.^[4]

Shortly after the 2014 elections, Bonini announced he would run for governor in the following election.^[5] He stated that his campaign would focus on fixing the state's "significant systemic and fundamental problems", although he faced a significant obstacle as a Republican running statewide in the heavily Democratic state.^[6] Bonini competed with former state trooper Lacey Lafferty in the Republican primary election, which he won with 70% of the vote.^[7] He lost to U.S. Congressman John Carney in the general election, garnering less than 40% of the vote.^[8] In 2020, Bonini again tried to run for governor but lost in the Republican primary to Julianne Murray, earning less than 35% of the vote.^[9][10] On September 13, 2022, Bonini was defeated in the Republican primary, finishing last place in a 3-way race.^[11]