Dayna Pidhoresky (born 18 November 1986) is a Canadian long-distance runner.^[1][2] She competed in the women's marathon at the 2017 World Championships in Athletics.^[3]

On 20 October 2019, Pidhoresky won the Canadian Olympic Trials Marathon in a time of 2:29.03. Her performance secured her position for the 2020 Tokyo Olympic Marathon representing Canada.^[4] However, on the flight to Tokyo, Pidhoresky was seated next to a passenger who subsequently tested positive for COVID-19, and as a result was required to quarantine for fourteen days without access to training facilities. Despite this, she opted to compete, finishing the race in seventy-third and last place with a time of 3:03:10. She said that "a month ago, that would have been so disappointing because I had big goals, but as we approached the race I really had to alter my goals. I didn't think I was going to make it to the start line."^[5]

Pidhoresky currently holds the women's record for the Vancouver Marathon with a time of 2:34:37, breaking the record she previously set in 2022 by three seconds.^[6][7]