Tempe, tofu and soy sauce are the main products of soybean commonly consumed in the daily food for the people of Indonesia. Due to its high protein content and the presence of significant antioxidant activities, soybean is considered as functional food. Antioxidant could improve and maintain human health due to its ability to nullify the negative effect of reactive oxygen. The present study was carried out to evaluate total phenolic content and antioxidant activities of some Indonesian black soybean seeds. Observation was done in three replicates and standard deviation was made. The results of the present study showed a variability of total phenolic content and antioxidant activities among the black soybean seeds tested. The soybean variety Detam 2 revealed the highest phenolic content and antioxidant activities as measured with ABTS and DPPH methods. Antioxidant activity of black soybean seeds was highly correlated to total phenolic content. Thus, phenolic content could be used as a good indicator of soybean high in antioxidant. In all black soybean varieties tested, antioxidant activity was found to be mainly located in the seed coat.