The obturator foramen is the large,[citation needed] bilaterally paired opening of the bony pelvis.

The obturator foramen is situated inferior and somewhat anterior to the acetabulum.

[1] The margin of the foramen is thin and uneven, and gives attachment to the obturator membrane.

[1] Unilateral pelvic hypoplasia can cause differences in size between the obturator foramina.

[2] This article incorporates text in the public domain from page 237 of the 20th edition of Gray's Anatomy (1918)