Mount Islip (/ˈaɪslɪp/ EYE-slip) is a 8,250-foot (2,515 m) peak in the Angeles National Forest in California, United States.

On a clear day the sharp, high peak provides impressive views of the Mojave Desert, the Los Angeles Basin, Santa Catalina Island, and San Clemente Island.

[5] The peak is named for George Islip, a homesteader who lived in the surrounding area during the late 19th century.

[7] A remnant of the lookout site, a rock cabin, remains near the summit to this day.

A trailhead for climbing Mount Islip is located at Islip Saddle, along the Angeles Crest Highway, approximately 53 miles (85 km) northeast of downtown Los Angeles.