Table tennis at the 2012 Summer Olympics in London took place from Saturday 28 July to Wednesday 8 August 2012 at ExCeL London. 174 athletes, 86 men and 88 women, competed in four events. Table tennis has appeared at the Summer Olympics on six previous occasions beginning with the 1988 Games in Seoul. In addition to men's and women's singles, the team events were staged for the second time since replacing doubles events at the 2008 Beijing Games. China was the defending champion in each of the Olympic events having won all 4 gold medals in 2008.

Table tennis is a racket sport derived from tennis but distinguished by its playing surface being atop a stationary table, rather than the court on which players stand. Either individually or in teams of two, players take alternating turns returning a light, hollow ball over the table's net onto the opposing half of the court using small rackets until they fail to do so, which results in a point for the opponent. Play is fast, requiring quick reaction and constant attention, and is characterized by an emphasis on spin relative to other ball sports, which can heavily affect the ball's trajectory.