Lyons Peak is a prominent mountain in San Diego County, California. The top of the mountain is enclosed in an almost rectangular patch of Cleveland National Forest. An old fire lookout tower is located at the peak.

Lyons Peak is located on restricted land and trespassing is prohibited. The peak's toponym honors Nathaniel Lyon (1818–1861).Colonel Hans Christian Adamson (2016), Rebellion In Missouri 1861: Nathaniel Lyon And His Army Of The West, Golden Springs Publishing, (Originally published: 1961), As an army captain, he passed by the peak in 1851 while scouting a new route east to the desert.Priscilla Lister (2016), Take a Hike: San Diego County, Archway Publishing,

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