The Rural Municipality of Alexander (French: Municipalité rurale d'Alexander)[2] is a rural municipality in the Eastman Region of Manitoba, Canada.

The town of Powerview-Pine Falls lies adjacent to the municipality, as does the Sagkeeng First Nation Indian reserve.

The municipality contains all of Manitoba's Belair Provincial Forest in its westernmost part, plus the northern half of Brightstone Sand Hills Provincial Forest in its central part.

It was first incorporated as a Local Government District in 1945 and received its present status as a rural municipality on 1 January 1997.

Parts of the RM (Great Falls area) had been under a boil water advisory since April 18, 2006, until a $5-million water treatment plant was installed in September 2019.