This study looked at how cooperative credit, training, and business advice services impact the performance of small and medium enterprises in Delta State, Nigeria. The study employed the survey research design. The sample size of 210 owners of small and medium enterprises was determined using the Taro Yamane formula, and a stratified random sampling technique was in the selection of the SME owners. The primary data required in the study were sourced with the aid of a structured questionnaire, and the multiple regression analysis was used for the research. The study found that cooperative' credit facilities, training, and advisory services are positively and significantly related to SMEs' performance with respect to profitability, sales growth, and expansion. The study concludes that cooperative credit facilities, training programmes, and advisory services significantly impacted SMEs' performance in Delta State, Nigeria, and recommends that SME owners should join and take an active part in cooperative activities.