Sergey Mikhaylovich Brin (Russian: Серге́й Миха́йлович Брин; born August 21, 1973) is a Russian-born American computer scientist and internet entrepreneur who, together with Larry Page, co-founded Google, one of the world's most profitable Internet companies. According to Hurun Global Rich List 2015 he is jointly one of three people listed as 18th richest in the world (21 overall) with a net worth of US$30 billion.

Brin immigrated to the United States with his family from the Soviet Union at the age of 6. He earned his bachelor's degree at the University of Maryland, following in his father's and grandfather's footsteps by studying mathematics, as well as computer science. After graduation, he moved to Stanford University to acquire a PhD in computer science. There he met Page, with whom he later became friends. They crammed their dormitory room with inexpensive computers and applied Brin's data mining system to build a web search engine. The program became popular at Stanford and they suspended their PhD studies to start up Google in a rented garage.