Actinomyces is an anaerobic, gram-positive bacteria saprophyte of the oral cavity, lungs, genital and gastro-intestinal tracts. Tubo-ovarian infection is rare. The authors report a case of tubo-ovarian abscess, due to actinomyces ruptured in the sigmoid and diagnosed in a 30-year-old woman using an intra-uterine device for more than 5 years. After salpingo-oophorectomy and partial sigmoid resection, pathology confirmed the diagnosis.