William Fields

William Fields (born June 21, 1978) is a former professional Canadian football defensive back in the Canadian Football League (CFL) and most recently served as the defensive coordinator for the Ottawa Redblacks. He is a three-time Grey Cup champion, once as a player with the Calgary Stampeders in 2001 and twice as a coach with the Argonauts in 2022 and 2024.

College career Fields played college football for the Houston Cougars from 1996 to 1999.

Professional career Calgary Stampeders Fields signed with the Calgary Stampeders on May 8, 2001. He played and started in all 18 regular season games where he recorded 41 defensive tackles ad five interceptions. He played in three more seasons with the team where he totaled 165 tackles and nine interceptions in 65 regular season games. In 2006, he played in four games and made six defensive tackles before being released on August 8, 2006.

On February 9, 2017, it was announced that Fields had joined the Hamilton Tiger-Cats as a defensive and special teams assistant. In 2018, he was promoted to defensive backs coach with the Tiger-Cats.

Fields was hired by the Edmonton Eskimos for the 2019 season as a defensive assistant, but later resigned on May 9, 2019, to join the Tampa Bay Vipers as the defensive backs coach for their 2020 season. After the Vipers and the XFL ceased operations, Fields was hired by Peru State College to serve as their defensive coordinator and defensive backs coach. In his first year with the Argonauts, he won his first Grey Cup as a coach as the team defeated the Winnipeg Blue Bombers in the 109th Grey Cup game. In his first year in this role, he helped the Argonauts to victory in the 111th Grey Cup game.

Ottawa Redblacks On January 6, 2025, Fields was named the defensive coordinator for the Ottawa Redblacks. He spent two seasons with the team before being fired on August 1, 2026, after a 0–7 start to the 2026 season.