We introduce the notion of an intuitionistic fuzzy ideal of a gamma-ring $M$, and then some related properties are investigated. Characterizations of intuitionistic fuzzy ideals are given. Given an intuitionistic fuzzy ideal $A=(\mu_{_{A}},\gamma_{_{A}})$ of a $\Gamma$-ring and a homomorphism $f$ of $\Gamma$-rings, we construct a new intuitionistic fuzzy ideal $A^f=(\mu_{_{A}}^f,\gamma_{_{A}}^f)$.