Bjarni Valdimar Tryggvason (September 21, 1945 – April 5, 2022) was an Icelandic-born Canadian engineer and a NRC/CSA astronaut. He was a Payload Specialist on Space Shuttle mission STS-85 in 1997. It was a 12-day mission to study changes in the Earth's atmosphere. Tryggvason was born in Reykjavík, Iceland. He grew up in Vancouver, British Columbia.