George Clifford Thomas Jr. (October 3, 1873 – February 23, 1932) was an American golf course architect, botanist, and writer.

He was a founding member of Sunnybrook Golf Club, and witnessed Donald Ross's 1914-15 construction of its original course in Flourtown, Pennsylvania.

If your mind cannot recall the exact sequence of the holes, that course lacks the great assets of originality and diversity.

[7] In 1912, he began breeding roses on Bloomfield Farm, trying to create a variety that would thrive in Philadelphia's Mid-Atlantic climate.

[9] Geoff Shackelford, a golf course architect and author, wrote a 1995 history of Riviera Country Club and a 1996 biography of Thomas.

[11] In 2010, Gil Hanse restored the North Course at Los Angeles Country Club to Thomas's 1921 design.

[13] In June 2012, the first George C. Thomas Jr. Invitational Tournament was held on the North Course at Los Angeles Country Club.