Nan Grogan Orrock (born November 8, 1943) is a Democratic state senator in the Georgia State Senate for the State Senate, district 36. Following the 2006 retirement of State Senator Sam Zamarripa, Orrock was a candidate for his district; in the Democratic primary held on July 18, 2006 Orrock defeated Grace Davis to win a seat in the State Senate since she has no Republican opponent for the general election. She was sworn into office in 2007.
She was previously a member of the Georgia House of Representatives from 1987, representing the 58th district. She was the Vice-Chair of the House Democratic Caucus and the former Majority Whip.