Background - Ovarian masses may be either physiological or pathological. Physiological ovarian masses are non-neoplastic. Pathological masses grow more than 7 cm and persist beyond 3 months; they do not resolve spontaneously, and invasive surgery with removal of reproductive organs is the conventional treatment. It usually results in further co-morbidities and hampers the quality of life of the patient. Objectives - This case series of pathological left ovarian masses demonstrates the role of homeopathic treatment in each of two multiparous women where the right ovary was surgically removed previously for similar pathology and in an adolescent girl with increased tumor marker CA-125. Methods - Three cases of women with pathological ovarian masses in the left ovary, and advised invasive surgery by attending gynecologists, were treated with homeopathic medicines at the outpatient department of the National Homeopathy Research Institute in Mental Health, Kottayam, Kerala, from 2017 to 2020. Each case was followed up with clinical and ultrasonographic evidence and reported according to the criteria set out in the HOM-CASE guidelines. Result - Complete resolution of the ovarian masses was observed in all three cases, evidenced by ultrasonography, with normalizing CA-125 values also observed in the case of endometrial cyst. The patients improved within 4 to 15 months of treatment using Thuja and other individualized homeopathic medicines. The MONARCH score was calculated as +7/13, +9/13, and +9/13 for the three cases, respectively, indicating a positive causal attribution of homeopathy in the resolution of these pathological ovarian masses. Conclusion - This case series suggests that individualized homeopathy, and notably Thuja, can be useful in the treatment of pathological ovarian masses.