The women's 100 metres competition at the 1968 Summer Olympics in Mexico City, Mexico. The event was held at the University Olympic Stadium on October 14–15. The race was won by defending champion Wyomia Tyus. She became the first person to defend the championship at 100 metres, a feat later duplicated by Carl Lewis, Gail Devers, Shelly-Ann Fraser-Pryce, Usain Bolt and Elaine Thompson-Herah. Director Bud Greenspan filmed Tyus casually dancing behind her starting blocks before the Olympic final. When interviewed later she said she was doing the "Tighten Up" to stay loose. American commentator Dwight Stones suggests this intimidated her opponents.