Geoffrey James Nicholls (29 February 1944 – 28 January 2017) was a British musician and keyboardist, and longtime member of the heavy metal band Black Sabbath, until 2004. Nicholls also played in the NWOBHM band Quartz before joining Black Sabbath. In the 1960s/early 1970s, Geoff played lead guitar for the Birmingham bands The Boll Weevils, The Seed, Johnny Neal and the Starliners, and played keyboards for World of Oz.