Mark Bailey may refer to: Mark Bailey (diplomat) (born 1951), Canadian diplomat Mark Bailey (rugby union) (born 1960), English rugby player, headmaster and professor of Later Medieval History Mark Bailey (baseball) (born 1961), former catcher in Major League Baseball Mark Bailey (conductor) (born 1962), conductor and composer of Slavic sacred music Mark Bailey (cricketer) (born 1970), New Zealand cricketer Mark Bailey (footballer) (born 1976), former professional football defender Mark Bailey (politician), Australian politician Mark Bailey (writer) (born 1968), American writer Bill Bailey (born 1965), real name Mark Bailey, British comedian Mark Bailey, a personal trainer on the British TV series The Biggest Loser