The Lassen Street olive trees, also known as 76 mature olive trees, are a Los Angeles Historic-Cultural Monument located along Lassen Street between Topanga Canhon Boulevard an Farralone Avenue in the Chatsworth community of the northwestern San Fernando Valley, in Los Angeles, California.
A row of olive trees (olea europaea) were planted in 1893 along a then dirt road by Nelson A. Gray. The Grays moved from Pasadena to Chatsworth in 1892. The trees are believed to have been grown from cuttings taken from the olive orchard at the Mission San Fernando Rey de España.
The trees were designated a Historic-Cultural Monument in May 1967. According to the Chatsworth Daughters of the American Revolution chapter, there were 68 trees surviving/remaining in the 2010s.