Plessur is a district of the canton of Graubünden, Switzerland. It has an area of 266.73 km² and a population of 38,899 people (as of December 2004). The district is named after the river Plessur which crosses it.
Plessur contains 3 Kreise (sub-districts) Chur, Churwalden and Schanfigg, which makes a total of 16 municipalities: