John S. Armstrong (November 18, 1850 – April 26, 1908) was an American real estate developer.
He was the co-founder (along with Thomas Marsalis) of the former City of Oak Cliff (now incorporated into Dallas) and founder of the town of Highland Park, Texas.
[4] Around 1906, he purchased land north of Dallas which he had developed into the residential community of Highland Park.
Armstrong died April 26, 1908, in Dallas, Texas, and is buried at Oakland Cemetery.
He was survived by his wife, Alice J., and two daughters: Mrs. Minnie May (Edgar L.) Flippen and Mrs. Johnetta (Hugh) Prather.