Plessur District (German:
Bezirk Plessur, Romansh: ) is a former administrative district in the canton of Graubünden,
Switzerland 
. It had an area of 266.73 km2 (102.99 sq mi) and has a population of 40,707 in 2015. The former district is named after the river Plessur which crosses it. However, the region along the Plessur –and therefore the whole valley–is called
Schanfigg 
. It was replaced with the
Plessur Region 
on 1 January 2017 as part of a reorganization of the Canton.
Plessur District consisted of three
Kreise (sub-districts)
Chur 
,
Churwalden 
and Schanfigg, which are formed from a total of twelve municipalities:
^a Includes the area of
Malix 
and
Parpan 
which merged into Churwalden on 1 January 2010.
^b Includes the area of
Calfreisen 
, Castiel,
Langwies 
,
Lüen 
,
Molinis 
,
Peist 
and St.