John Taylor Doolittle (born October 30, 1950), American politician, was a Republican member of the United States House of Representatives from 1991 to 2009, representing California's 4th congressional district. In the 109th Congress, he held a leadership role as the Deputy Whip for the Republican party in the House. Both he and his wife are currently under investigation for serious ethical violations as part of the Jack Abramoff bribery case. He was succeeded in the House of Representatives by Tom McClintock.

Doolittle was born in Glendale, California. He grew up in Cupertino, California, graduating from Cupertino High School in 1968. He graduated with honors with a B.A. in History from the University of California, Santa Cruz. He also has a law degree from McGeorge School of Law, University of the Pacific, in Sacramento, in 1978.

Doolittle spent two years as a missionary in Argentina for The Church of Jesus Christ of Latter-day Saints before going to law school. Doolittle is married to the former Julia (Julie) Harlow. They have a son and daughter.