Grewcock's sportive lemur (Lepilemur grewcockorum), or the Anjiamangirana sportive lemur, is a sportive lemur endemic to Madagascar. It is a medium-sized sportive lemurs with a total length of about 55 to 63 centimeters, of which 26-30 centimeters are tail. Grewcock's sportive lemur is found in northwestern Madagascar, living in dry deciduous forests. Originally named L. grewcocki, the name was found to be incorrectly formed and was corrected to L. grewcockorum in 2009.