2021 West Coast Eagles season

The West Coast Eagles are an Australian rules football team based in Perth, Western Australia. Their 2021 season was their 35th season in the Australian Football League (AFL), their eighth season under premiership coach Adam Simpson, and their second season with Luke Shuey as captain. Having finished in the top eight every season since 2015, it was expected that West Coast would do the same in 2021. They won eight of their first thirteen matches, including an unexpected win against Port Adelaide, and a 97-point thrashing by Geelong, placing them seventh on the ladder before their midseason bye. They continued on to lose seven of their remaining nine matches, including a 92-point loss to Sydney, and their first Western Derby loss since 2015, causing them to finish ninth, missing finals.

The COVID-19 pandemic continued to have an impact on the season, with crowd restrictions at some matches and some changes to the fixture during the season. Jack Darling, who kicked 42 goals, was the club's leading goal-scorer for the fourth time in his career. Nic Naitanui was the only Eagle to be in the All-Australian squad. Nic Naitanui was West Coast's best and fairest player, winning the John Worsfold Medal. 2021 was the second year for West Coast in the AFL Women's competition, in which they finished twelfth. It was also the second year in which West Coast fielded a team in the Western Australian Football League, after having withdrawn in 2020.