Gregory Reginald "Greg" James (born 15 September 1944) is a former Judge of the Supreme Court of New South Wales.
Admitted as a barrister in 1972, at age 38 in 1982, James was one of the youngest Queen's Counsel ever appointed in New South Wales.
He was one of several counsel involved in legal proceedings in the aftermath of the 1970 Bathurst Gaol Riots; as well as lead counsel for the Bandidos Motorcycle Club during the Milperra Massacre, one of the largest single trials in Australian history.