Santhosh Kesavan Nayar is an Indian actor who appears in Malayalam cinema.

Santhosh was brought up by his maternal grandparents, advocate K. S. Chellappan Pillai and B. Parukuttyamma, ever since his parents left to Ethiopia on deputation.

Both his sisters turned out to be gynaecologists while he wanted to pursue a career as an actor.

[citation needed] He made his debut through Malayalam movie Ithu Njangalude Katha directed by P. G. Viswambharan in 1982.

He married Subhasree V., a high-school teacher by profession; they have a daughter, Rajasree S.