The lesser sciatic foramen is an opening (foramen) between the pelvis and the back of the thigh.

The foramen is formed by the sacrotuberous ligament which runs between the sacrum and the ischial tuberosity and the sacrospinous ligament which runs between the sacrum and the ischial spine.

The lesser sciatic foramen has the following boundaries: Alternatively, the foramen can be defined by the boundaries of the lesser sciatic notch and the two ligaments.

The following pass through the foramen: This article incorporates text in the public domain from page 309 of the 20th edition of Gray's Anatomy (1918)