Little Si, Mountain in Washington, United States

Little Si is a forested hill near North Bend, Washington, with a hiking trail that gains about 1,200 feet (370 m) in elevation. The trail runs through dense second-growth forest and ends at a rocky viewpoint looking out over the Snoqualmie Valley.

Little Si and its taller neighbour Mount Si were named after Josiah "Uncle Si" Merritt, a local homesteader. The two are separate peaks, divided by a valley, each with its own trailhead. Little Si reaches 1,576 feet (480 m) on the western margin of the Cascade Range, just east of North Bend, Washington.

Little Si and its taller neighbour Mount Si were named after Josiah "Uncle Si" Merritt, a local homesteader. The peak is also known among climbers for its rock climbing and bouldering, so visitors may see people scaling its crags rather than only walking the trail.

The Little Si trailhead sits at about 47°29′14″N 121°45′12″W, just east of North Bend on the western edge of the Cascades. Little Si has its own trailhead and is separated from Mount Si by a valley, so the two peaks are not reached from the same starting point. The summit stands at 1,576 feet (480 m).

The trail connects to the Boulder Garden Loop, which can be entered from two different points along the main path, letting hikers add a side circuit or cut through to the Mount Si trail network. This makes Little Si a starting point for longer routes rather than just a short outing.