This study sought to examine the effect of strategic alliances on performance of supermarkets and their alliances in Kenya. The objectives of the study were to establish the effects of technological, production and marketing strategic alliances on the performance of supermarkets in Kenya. The study employed a cross sectional correlational research design. The sample of the study entailed a study of all the five leading supermarkets in Kenya (Nakumatt, Ukwala, Naivas, Tuskys and Uchumi) and 95 of their strategic partners. Data for this study was collected from the head offices of the firms by use of a questionnaire. The data was analyzed using correlation analysis and multiple regression models in order to test the hypothesis. ANOVA test and t-test were used to determine the level of significance. Data was presented using figures and tables. The correlation coefficient(R) value for supermarket alliances and performance was 0.017. This means that there is a weak insignificant relationship between strategic alliances and performance. The correlation coefficient(R) value showed that there is a strong significant relationship between strategic alliances and supermarkets’ performance. The overall significance of the strategic alliances and supermarket performance model was 0.002 with an F value of 0.95. This means that there is a statistical significant relationship between strategic alliances and supermarkets’ performance. This study, therefore, concluded that strategic alliances have a positive effect on supermarkets’ performance. The overall significance of the strategic alliances and supermarket alliances’ performance model was 0.657 with an F value of 0.539. This means that there is no statistical significant relationship between strategic alliances and supermarket alliances’ performance.