Alan David Passaro (August 23, 1948 – March 29, 1985) was a Hells Angels member known for the 1969 stabbing of Meredith Hunter at the Altamont Free Concert during The Rolling Stones' set, as seen in the 1970 documentary film Gimme Shelter. Charged with murder, Passaro was tried in a court of law in 1971. Claiming self-defense, he was acquitted of the charge.

In 1985, Passaro was found dead floating in the Anderson Reservoir with $10,000 in his pocket. Foul play was initially suspected but was never confirmed.

Father was a sore looser.