51 (2021 population: 343) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No.

Located in the southwest corner of the province, it is adjacent to the United States border to the south and the Alberta boundary to the west.

An alternative explanation is that RENO is an acronym of four rural post offices in the vicinity - Russthorn (near Robsart), Eden Valley (southwest of Cypress Lake), Nashlyn (south of Consul), and Oxarat (west of Cypress Lake).

Although Nashlyn then lay outside the boundary of the RM, similar acronymic names are not unknown on the Canadian prairies; see also Sangudo, Alberta.

[12] Govenlock-Nashlyn-Battle Creek Grasslands (SK 039) is an Important Bird Area (IBA) of Canada[13] located at the south-western corner of the RM of Reno.

Originating from the Cypress Hills to the north, several of the streams that run through the site have been dammed to provide water for cattle.

A variety of birds are found in the IBA, including the sage grouse, prairie falcon, golden eagle, ferruginous hawk, violet-green swallow, burrowing owl, rock wren, short-eared owl, sage thrasher, rough-legged hawk, long-billed curlew, Sprague's pipit, Baird's sparrow, Brewer's sparrow, chestnut-collared longspur, McCown's longspur, and the Bullock's oriole.

51 is governed by an elected municipal council and an appointed administrator that meets on the second Wednesday of every month.