Abstract: Small and Medium-Sized Enterprises (SMEs) face tremendous challenges in their attempt to pursue innovations. Innovation has been considered as a key element for the growth of small and medium sized enterprises (SMEs) for a long time. This field of research has been a subject to numerous studies. In Algeria, however, very few researches have dealt with this subject. The aim of this paper is to explore the effects of the organizational, process, product and marketing innovations on the different aspects of small and medium-sized enterprises (SMEs) performance.