The decision comes after a poor showing in Tuesday's New Hampshire primary, and after she failed to qualify for consecutive Republican debates. In her announcement, Fiorina took a jab at her favorite target: Democratic front-runner Hillary Clinton.
"To young girls and women across the country, I say: do not let others define you," Fiorina, the former Hewlett-Packard executive, said in statement. "Do not listen to anyone who says you have to vote a certain way or for a certain candidate because you're a woman. That is not feminism."
New Jersey Gov. Chris Christie also dropped out of the race for the Republican nomination Wednesday.