Thomas McKeen Chidsey (January 26, 1884 – April 19, 1958) was a Pennsylvania lawyer and judge.

He served a term as the state's Attorney General, and was an associate justice of the state's Supreme Court.

In 1913, he married Ellen Lea, and they had two daughters.

[1] He was District Attorney for Northampton County, 1920–23.

He was appointed in 1950 to fill a vacancy on the state's Supreme Court, and was then elected to a full 21-year term.