Thomas Langlois Lefroy was an Irish-Huguenot politician and judge. He served as an MP for the constituency of Dublin University in 1830–1841, Privy Councillor of Ireland in 1835–1869 and Lord Chief Justice of Ireland in 1852–1866.

The Court of King's Bench was one of the senior courts of common law in Ireland. It was a mirror of the Court of King's Bench in England. The Lord Chief Justice was the most senior judge in the court, and the second most senior Irish judge under English rule and later when Ireland became part of the United Kingdom. Additionally, for a brief period between 1922 and 1924, the Lord Chief Justice of Ireland was the most senior judge in the Irish Free State.