Tatchun was an electoral district which returned an MLA to the Legislative Assembly of the Yukon Territory in Canada.

When partisan politics was introduced to the Yukon in the 1978 election, Tatchun was one of the initial electoral districts established.

It was bordered by the ridings of Mayo, Klondike, Faro, Kluane, Hootalinqua, and Campbell.

[1] Tatchun is also the former seat of Roger Coles, leader of the Yukon Liberal Party from 1984 to 1986.

He later resigned both his seat and his position as leader after being sentenced to prison time for cocaine trafficking.