Sian Louise Massey-Ellis, is an English football match official who officiates generally in the role of assistant referee in the Premier League and the Football League. She has also been appointed to matches in the Football League Trophy, UEFA Women's Champions League, FIFA Women's World Cup qualification rounds, the FIFA Women's World Cup and the UEFA Europa League. Massey-Ellis turned professional in 2010 and was appointed to the FIFA list of women assistant referees in 2009.