Nathan Gregor Mendel (born December 2, 1968) is a rock bassist. He was a member of Sunny Day Real Estate before joining the Foo Fighters in 1995 after SDRE had disbanded. Mendel reunited with Sunny Day Real Estate in 1998 for two more albums before the group broke up a second time. He then joined with other SDRE members Jeremy Enigk and William Goldsmith to form The Fire Theft, who released a self-titled album in 2003.