Altivasum flindersi is a species of sea snails, marine gastropod molluscs in the family Vasidae.

(Original description) The shell is large, yet relatively light and thin for its size, with an ovate-acuminate shape and a broad, deep perforation.

The shell consists of eleven gradate whorls that increase gradually in size, are angled at the suture, and contract at the base before extending into the siphonal canal.

The aperture is slightly channeled above, transitioning below into a short, narrow, recurved siphonal canal.

Deep within the aperture, low on the columella, are three prominent and well-spaced plaits, the lowest of which nearly overlaps the umbilical margin of the preceding whorl.