In this paper, we investigate the notion of approximate biprojectivity for semigroup algebras and for some Banach algebras related to semigroup algebras. We show that 1(S) is approximately biprojective if and only if 1(S) is biprojective, provided that S is a uniformly locally finite inverse semigroup. Also for a Clifford semigroup S, we showthat approximate biprojectivity of 1(S) ∗∗ gives pseudo-amenability of 1(S). We give a class of Banach algebras related to semigroup algebras which is not approximately biprojective.
