Recently, the algebraic theory of MV -algebras is intensively studied.
In this paper, we extend the concept of derivation of $MV$-algebras and we give some
illustrative examples. Moreover, as a generalization of derivations of $MV$ -algebras
we introduce the notion of $f$-derivations and $(f; g)$-derivations of $MV$-algebras.
Also, we investigate some properties of them.