The Rural Municipality of Argyle No. 1 (2016 population: ) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No. 1 and Division No. 1. It is located in the southeast corner of the province along Highway 18.
The RM of Argyle No. 1 incorporated as a rural municipality on December 19, 1912. Prior to it was Local Improvement District No. 1.
The exact derivation of the RM's name is unknown, as numerous Argyles and Argylls exist in Western Canada. Argyle Street in Regina and the Rural Municipality of Argyle in Manitoba were both intended to honour Sir John Campbell, 9th Duke of Argyll and fourth Governor General of Canada. Why both adopted a more phonetic spelling of the name, most commonly used to refer to a type of knitting pattern, is unknown.
The eastern boundary of the RM is the Municipality of Two Borders, in Manitoba. The southern boundary of the RM is the United States border at Renville County and Bottineau County, both in North Dakota.
The following urban municipalities are surrounded by the RM.
In the 2021 Census of Population conducted by Statistics Canada, the RM of Argyle No. 1 had a population of living in of its total private dwellings, a change of from its 2016 population of . With a land area of , it had a population density of in 2021.
In the 2016 Census of Population, the RM of Argyle No. 1 recorded a population of living in of its total private dwellings, a change from its 2011 population of . With a land area of , it had a population density of in 2016.
The RM of Argyle No. 1 is governed by an elected municipal council and an appointed administrator that meets on the second Tuesday of every month. The reeve of the RM is Jack Ryckman while its administrator is Erin McMillen. The RM's office is located in Gainsborough.