A gunman shot at people inside Oikos University, a Korean Christian college in Oakland, California, leaving seven people dead and three injured.

On April 2, 2012, a mass shooting occurred inside Oikos University, a Korean Christian college in Oakland, California, United States. Seven people were killed, and three others were injured. One L. Goh, a former student at the school, was taken into custody and identified as the suspect in the shooting. It is the deadliest mass killing in the city's history.

Oikos University is a private Korean Christian university in Oakland, California. The university is accredited by the Transnational Association of Christian Colleges and Schools (TRACS).

The practice of Christianity is marginal in North Korea, but significant in South Korea, which has a population of 8.6 million Protestants, mostly Presbyterians, and 5.8 million Catholics. Christianity in the form of Catholicism was first introduced during the late Joseon Dynasty period by Confucian scholars who encountered it in China. In 1603, Yi Su-gwang, a Korean politician, returned from Beijing carrying several theological books written by Matteo Ricci, an Italian Jesuit missionary to China. He began disseminating the information in the books, introducing Christianity to Korea. In 1787, King Jeongjo of Joseon officially outlawed Catholicism as an "evil practice," declaring it heretical and strictly banned. Catholicism was reintroduced in 1785 by Yi Seung-hun and French and Chinese Catholic priests were soon invited by the Korean Christians.

Oakland is a city in the East Bay region of the San Francisco Bay Area in the U.S. state of California. It is the county seat of and the most populous city in Alameda County, with a population of 440,646 in 2020. A major West Coast port, Oakland is the most populous city in the East Bay, the third most populous city in the Bay Area, and the eighth most populous city in California. It serves as the Bay Area's trade center: the Port of Oakland is the busiest port in Northern California, and the fifth- or sixth-busiest in the United States. A charter city, Oakland was incorporated on May 4, 1852, in the wake of the state's increasing population due to the California gold rush.