The Western Derby is the name given to the Australian rules football match between the West Coast Eagles and the Fremantle Dockers, who both participate in the Australian Football League (AFL). As both teams are based in Perth, the capital city of Western Australia, the term "derby" is used to describe the match. It has become the most important match for football in Western Australia, with former West Coast player and coach John Worsfold claiming that in the week before a derby that it is the main topic in Perth.It's obviously different to the build-up of any normal game... We don't care what else is happening in the country, which is great."

The West Coast Eagles are a professional Australian rules football club based in Perth, Western Australia. The club was founded in 1986 as one of two expansion teams in the Australian Football League (AFL), then known as the Victorian Football League. The club plays its home games at Optus Stadium and has its headquarters at Lathlain Park. The West Australian Football Commission wholly owns the West Coast Eagles and the Fremantle Football Club, the AFL's other Western Australian team.