Mount Marcus Baker (Ahtna: Ts'itonhna Dghilaaye’; Dena'ina: Ch'atanhtnu Dghelaya) is the highest peak of the Chugach Mountains of Alaska.

This peak is very prominent because of its proximity to tidewater and is only 12 miles (19 km) north of the calving face of Harvard Glacier.

Despite being much lower in elevation than Denali, Marcus Baker is a similarly serious ascent, due to the remoteness of the peak and resulting length of the approach and climb.

[3] A number of noted climbers have perished or sustained permanent injury in attempting to summit the peak as climbing conditions can change rapidly as storms arise.

In early 1988, a State of Alaska Fish and Game biologist, 28-year-old Sylvia Jean Lane, succumbed to hypothermia as a two-day storm separated her from the two others in the climbing party attempting to dash to the top in a winter ascent.