The present invention relates to 3-[(1,3-thiazol-4-ylmethoxyimino)(phenyl)methyl]-2-substituted-1,2,4-oxadiazol-5(2H)-one derivatives of formula (I), their process of preparation, their use as fungicide active agents, particularly in the form of fungicide compositions, and methods for the control of phytopathogenic fungi, notably of plants, using these compounds or compositions.