Vincent Francis Callahan Jr. (October 30, 1931 – September 20, 2014) was an American politician who served for 40 years as a member of the Virginia House of Delegates. From January 1968 to January 2008, he represented the 34th district, which covers McLean, Great Falls, Tysons Corner, and parts of Herndon and Vienna. At the time of his retirement, he was the longest-serving Republican in the Virginia General Assembly.