James Yoshinobu Iha (井葉吉伸, Iha Yoshinobu) (Born March 26, 1968) is an American rock musician. He is best known as guitarist and co-founder of the alternative rock band The Smashing Pumpkins and for his electric musical projects of recent years, most notably being a permanent fixture of A Perfect Circle. He was most recently a member of Tinted Windows, a 1960s/1970s inspired group with members of Cheap Trick, Fountains of Wayne, and Hanson.

He also co-owns independent record label Scratchie Records with Adam Schlesinger of Fountains of Wayne and a recording studio with Schlesinger and Andy Chase of Ivy called Stratosphere Sound in Manhattan. Bands on the Scratchie label include The Sounds, Albert Hammond Jr., and Office.