The Celtics have 6 logos over their over 65 years of existence.
1947-1950: A green circle outlined in orange, with a white shamrock on it.
1951-1960: A leprechaun with a crown jumping holding his cane. In black, white and yellow.
1961-1968: Same logo as before except with a orange background.
1969-1976: A red basketball with a leprechaun twirling a basketball.
1977-1996: Current logo without color.
1997-present: A leprechaun with his left eye winking at you, his left hand resting on his shillelagh, his right index finger is pointing straight upward with a brown basketball sitting atop, his left foot crossed over and to the side of the right foot, he possesses a big smile (with a pipe projecting from the right corner of his mouth) and he is dressed in black buckle shoes, black pants, a gold front-button vest with a matching bow tie (with green three-leaf clovers displayed prominently in view on both), a long-sleeved white shirt and all topped off with a black derby hat with the same matching three-leaf clovers.