Seavy Sike Force is a waterfall located on West Gill in the Yorkshire Dales, near the hamlet of Cotterdale just off the A684. It sits at the uppermost reach of a series of falls along the gill, roughly 1. 5 miles from the start of the ascent up the valley.

The waterfall is accessible on foot via a route that follows the beck through fields and then climbs along a track beside West Gill. Several gill crossings are required along the way, and after heavy rain these can be challenging.

Seavy Sike Force is the highest of multiple named falls on West Gill, which also include Acroy Force and Mathew Bridge Force lower down the valley.