Claire Gagnier (March 28, 1924 – December 25, 2022) was a Canadian soprano singer from Quebec.

[1] Gagnier was born in Montreal on March 28, 1924, and took voice lessons from Roger Filiatrault [de].

In 1944, she won first prize on the Canadian Broadcasting Corporation (CBC) program Singing Stars of Tomorrow.

Assisted by a grant from the provincial government, she attended the Juilliard School in New York City.

She performed in CBC radio and television opera broadcasts, including La bohème, Così fan tutte and Madama Butterfly.