The Boston Celtics logo since the early 1960s features a leprechaun spinning a basketball, named Lucky. It was originally designed by Zang Auerbach, the brother of Celtics head coach Red Auerbach. For a long time, the logo's only colors were black, white and green. Then for the 1996–97 season, celebrating the club's 50th anniversary, the logo got a full-color treatment. Lucky's face and hands were both painted tan, while gold was included on the vest, bow tie and hat, as well as brown on the ball and shillelagh, and black on its pants and shoes.
The Celtics also have various alternative logos, with the most popular being a white shamrock with the letters "Celtics" above it, wrapped in a green circle, which has been used since the 1998–99 season. The alternate logo is based on logos used by the Celtics before they used the Zang Auerbach leprechaun. For much of its history, the shamrock was trimmed in gold, as seen in the old team warmup jackets. A new secondary logo, unveiled in 2014, featured a variation of the leprechaun logo, albeit in silhouette form.