Megasurcula wynoocheensis is an extinct species of sea snail, a marine gastropod mollusk in the family Pseudomelatomidae, the turrids and allies.

[7] The name originates from the Wynoochee Valley of Washington state.

This is a slender, high-spired turrid with a strongly concave whorl profile and sutures riding high upon the vertical segment of the preceding whorls.

[6] Fossils of this marine species have been found in Miocene strata in the Pacific Northwest in the United States.

The type locality was a logging road west of Montesano, Washington.