Billy Greer (born January 26, 1952) is the current bass guitarist for the band Kansas. He joined the band in 1986 in time for the Power album. He had previously worked with vocalist Steve Walsh in the band Streets, and is currently working with his own band Seventh Key, as well as maintaining his status in Kansas.
Billy also manages his son's band "3 Story Fall" and produces their music. While also working on his new project "Native Window" with other Kansas members Ehart, Williams, and Ragsdale.