George Dale Derby (September 25, 1948 – August 24, 2021) was an American politician who served in the Oklahoma House of Representatives from the 74th district from 2017 to 2019.

After leaving St. Louis, he joined the United States Navy as a lieutenant colonel.

After leaving the Navy in 1979, Derby spent sixteen years in private practice as a primary care physician in Farmington, Missouri, before moving to Fresno, California, to serve as chief of an anesthesiology department.

[7] Oklahoma Speaker of the House Charles McCall later described Derby's time serving in the 56th Oklahoma Legislature saying "As a member of the House, Rep. Dale Derby was a conservative solution seeker who worked with others to address issues of the state.

"[4] After leaving the Oklahoma House of Representatives, Derby worked as an anesthesiologist in Owasso.