Louis-Joseph-Lucien Cardin PC QC (1 March 1919 – 13 June 1988) was a Canadian lawyer, judge, and politician.

Born in Providence, Rhode Island, the son of Octave Cardin and Eldora Pagé, he studied at Loyola College and at the Université de Montréal.

During World War II, he served in the Royal Canadian Navy and was discharged with the rank of Lieutenant Commander.

Cardin was the first Canadian politician to bring the public's attention to the Munsinger affair.

Although he got the name wrong and later insisted that he thought Gerda Munsinger had died, the media brought attention to the issue, and there was a federal inquiry that caught the public's attention for its implications to national security during the Cold War.