No. The former NBA player was spotted signing autographs for fans outside Jimmy Kimmel Live! in Hollywood, California - using his right hand. See image below.
Additionally, Basketball-Reference.com's Reggie Miller profile says that he shoots "right".
A volatile, high-voltage scorer from the off guard position, Reggie Miller was one of the supreme shooters of any era. With 2,560 made 3-pointers, he ended his career as the NBA's greatest long range shooter. He poured in 25,279 points to finish his career in 19th place on league's all-time scoring list.
Miller's final campaign began on the injured list after he broke a bone in his left hand during the preseason.
Since his retirement, he's been surpassed by Ray Allen as the NBA's all-time 3-point king and has moved down two pegs on the all-time scoring list. Still, his legend looms large. See more here: Legends profile: Reggie Miller.
Get the latest news, career info and more about Reggie Miller by following him on Twitter - @ReggieMillerTNT.
Of interest, check out TIME's list of the 10 of the most famous lefties.