Olivia DeMerchant (born February 16, 1991) is a Canadian rugby union player.

[2][3] DeMerchant played four seasons for St. Francis Xavier University where she studied.

[5] DeMerchant was selected in Canada's squad for the 2021 Rugby World Cup in New Zealand.

[6][7][8] In 2023, she scored a try against the Black Ferns in her sides 21–52 defeat at the Pacific Four Series in Ottawa.

[9][10] The match earned her her 55th cap and she now sits third all-time for Canada alongside Maria Gallo.