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Ballmer was born in Detroit; he was the son of Beatrice Dworkin and Frederic Henry Ballmer (Fritz Hans Ballmer), a manager at the Ford Motor Company. His father was a Swiss immigrant, and his mother was Belarusian Jewish. Through his mother, Ballmer is a second cousin of actress and comedian Gilda Radner. Ballmer grew up in the affluent community of Farmington Hills, Michigan.

In 2005, Microsoft sued Google for hiring one of its previous vice presidents, Kai-Fu Lee, claiming it was in violation of his one-year non-compete clause in his contract. Mark Lucovsky, who left for Google in 2004, alleged in a sworn statement to a Washington state court that Ballmer became enraged upon hearing that Lucovsky was about to leave Microsoft for Google, picked up his chair, and threw it across his office, and that, referring to former Google CEO Eric Schmidt (who previously worked for competitors Sun and Novell), Ballmer vowed to "kill Google." Lucovsky reports:  At some point in the conversation Mr. Ballmer said: "Just tell me it's not Google." I told him it was Google. At that point, Mr. Ballmer picked up a chair and threw it across the room hitting a table in his office. Mr. Ballmer then said: "Fucking Eric Schmidt is a fucking pussy. I'm going to fucking bury that guy, I have done it before, and I will do it again. I'm going to fucking kill Google."  Ballmer then resumed attempting to persuade Lucovsky to stay at Microsoft. Ballmer has described Lucovsky's account of the incident as a "gross exaggeration of what actually took place".  During the 2011 Web 2.0 Summit in San Francisco, he said: "You don't need to be a computer scientist to use a Windows Phone and you do to use an Android phone ... It is hard for me to be excited about the Android phones."  In 2013, Ballmer said that Google was a "monopoly" that should be pressured from market competition authorities.
Steve Ballmer