Robert J. Walker (known as Bob Walker; February 2, 1929 – February 15, 2016) was an American sailor. He was the third Master Chief Petty Officer of the Navy. On September 26, 1975, Walker was sworn in as the third Master Chief Petty Officer of the Navy. Walker was a much more conservative, traditional MCPON than his predecessor, John Whittet. He retired in the 1980s.