Thomas Lawrence Sansonetti (born May 18, 1949), is an attorney and a former government official from the U.S. state of Wyoming.

[6] In 1989, he became legislative director for newly elected U.S. Representative Craig L. Thomas, and shortly afterwards was chosen to be his chief of staff.

He then joined the Cheyenne law firm of Holland and Hart, where he worked until being appointed Assistant U.S. Attorney General for the Environment and Natural Resources Division of the Justice Department.

Sansonetti received the most votes from the GOP central committee to succeed his former mentor, Senator Thomas, who died on June 4, 2007.

Governor Dave Freudenthal appointed State Senator John Barrasso, an orthopedic surgeon from Casper.