John Nichol Irwin II (December 31, 1913 – February 28, 2000) was an American diplomat and attorney during the Cold War.

[1][2] During World War II, he served in the Army in the Pacific as a member of General Douglas MacArthur's staff and reached the rank of lieutenant colonel.

[1] After graduating from the Fordham University School of Law, he became an attorney, eventually working as a lawyer at Patterson, Belknap & Webb.

5, also known as the O RO Ranch, near Seligman, Arizona, from the Greene Cattle Company.

[4][5] In 1977, Irwin bought the Quien Sabe Ranch near Tres Pinos, California.