John D. "Jackie" Gaughan, Sr. (October 24, 1920 – March 12, 2014) was an Americancasino owner and gambler. Gaughan owned a casino in Las Vegas. It was El Cortez. Gaughan at one time owned more than 25 percent of the real estate in Downtown Las Vegas.
Gaughan died in Las Vegas, Nevada. He was 93 years old.