This interspinous vertebral implant comprises a body (11) which is intended to be inserted between two consecutive interspinous processes (3, 4), is compressible in the direction of the spine and is provided with means for anchoring it to at least one spinous process. The body (11) is formed by a single loop closed upon itself. The anchoring means are formed by two fixing lugs (12, 13) which are integral with the body (11), extend on either side of the spinous process in the area of which they are intended to anchor when the implant is in place, and are each traversed by a through-opening (14, 15) oriented in a direction substantially perpendicular to the general plane of said process, the through-openings being intended to receive fixing studs (23) to be crimped in the area of the process in question.