Bellator MMA: 2013 Summer Series was the third installment of the Bellator MMA Summer Series and started in June 2013. Mixed martial arts tournaments were held in the heavyweight, light heavyweight and bantamweight weight classes. Instead of the traditional eight-fighter tournaments Bellator has done throughout its run, it put on four-man tournaments. Originally, the plan was for three events over the summer months with an event in June, July and August. However, on June 23, it was confirmed that only two events would take place during this summer series.