Robert Keith Orton Sr. (July 21, 1929 – July 16, 2006) was an American professional wrestler. The patriarch of the Orton wrestling family, his two sons Bob Orton Jr. and Barry Orton, and grandson Randy Orton, have all wrestled professionally. To distinguish between him and his son, he is also known as Bob Orton Sr. Bob Orton Sr. was often referred to by his nickname "The Big O".
