A 20‐year retrospective review of 305 consecutive ovarian teratomas diagnosed in the surgical pathology department of the Kings County Hospital is presented. All but 10 cases represented the benign cystic variety of this tumor. One case of benign solid ovarian teratoma and 9 cases of malignant ovarian teratomas were also encountered. The laterality, age incidence, size, and gross and microscopic description of these tumors are discussed in considerable detail, as is the distribution of structures found within the benign cystic variety. Brief mention also is made regarding the incidence of struma ovarii, pregnancy, torsion, intraperitoneal rupture, and coincidental lesions found in association with ovarian teratomas.