Geoffrey Edward Blum (born April 26, 1973, in Redwood City, California) is a Major League Baseball infielder for the Houston Astros. Before becoming a professional baseball player, he majored in sociology at the University of California at Berkeley.

He began his professional career when he was selected in the seventh round of the 1994 amateur draft by the Montreal Expos. During his time with the Expo's, he spent the winter of 1995 in the Australian Baseball League with the Hunter Eagles.

After playing there for three years, he signed with the Houston Astros, and was then traded to Tampa Bay Devil Rays in exchange for Brandon Backe. In 2004 he batted only .215 for the Devil Rays, with a .266 OBP. He also played for San Diego Padres before the White Sox picked him up in mid-2005. It was at this point that Geoff earned the nicname "Random Man".