Clarence John Ostalkiewicz Jr. (19 September 1952 – 25 May 2010) was an American politician.
Ostalkiewicz was born in Massachusetts on 19 September 1952 to a textiles executive and raised in Rhode Island. He earned a bachelor's degree in business administration at Babson College, specializing in accounting, economics and finance. He started his diamond business in 1980. He moved to Windermere, Florida, in 1988. Ostalkiewicz served in the Florida Senate as a Republican from 1994 to 1998, defeating incumbent officeholder Gary Siegel. Ostalkiewicz left the state senate to run for Mayor of Orange County, Florida, losing to Mel Martínez, and thereafter retired from politics. In later life, Ostalkiewicz was diagnosed with kidney cancer. While receiving treatment for the disease in South Korea, he died of a heart attack on 25 May 2010, aged 57.[1][2]