William Leslie Cazneau (1807–1876) was a Texas pioneer and is credited with having buried the Alamo Heroes with full military honors.
Cazneau was born in Boston and came to Texas in 1830. He was the older son of ship master William L. Cazneau (1768–1866). In the late 1840s, he married Jane McManus Storms Cazneau (1807-1878, daughter of Congressman William McManus).
His brother was Gen. Thomas N. Cazneau of California (1812–1873). His sister was Mary Eliza Cazneau who married Joshua Holden in Texas in 1844 and later moved to Sonora, California in 1849.
He died at his estate in Jamaica in 1876.