Mount La Crosse, Mountain summit in Jefferson County, Washington, United States.

Mount LaCrosse is a 6,417-foot (1,956 m) summit in the Olympic Mountains of Jefferson County, Washington, inside Olympic National Park. Mount Elk Lick rises 2.54 mi (4.09 km) to the east, the Anderson massif 2.67 mi (4.30 km) to the north, and White Mountain 0.95 mi (1.53 km) to the southwest. Its rock is Eocene sandstone, turbidite and basaltic oceanic crust, shaped by Pleistocene glaciers.

The name comes from Lake LaCrosse below the peak. Members of the 1890 O'Neil Expedition called the lake "Lake of the Holy Cross" for a large tree whose trunk and branches formed a cross at its shore; the name shifted to "Lake of the Cross" and then LaCrosse. The summit itself was first climbed in 1928 by Richard Paulson, William Ryer, Paul Wiseman and Frank Woodworth.

The name comes from Lake LaCrosse below the peak. Members of the 1890 O'Neil Expedition called the lake "Lake of the Holy Cross" after a large tree whose trunk and branches formed a cross at its shore; the name shifted to "Lake of the Cross" and then LaCrosse. The peak is officially spelled Mount LaCrosse.

The mountain is most accessible from June through September when weather conditions are more stable for climbing efforts. Visitors should prepare for steep terrain and variable trail conditions throughout the ascent.

The summit serves as a watershed divide between two river systems, with water flowing toward both the Dosewallips and Duckabush Rivers. This role as a drainage divide separating water flow across the peninsula is often overlooked by visitors.