|Full name||Sian Louise Massey-Ellis|
|Date of birth||5 October 1985|
|Place of birth||Coventry, England|
|Other occupation||School teacher|
|2008–||Premier League||Assistant referee|
Sian Louise Massey-Ellis, MBE (née Massey; born 5 October 1985) 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 and FIFA Women's World Cup qualification rounds, having turned professional and appointed to the FIFA list of women assistant referees in 2010.
She is based in Coventry, West Midlands.
In May 2009, Massey-Ellis was appointed fourth official for the year's FA Women's Cup final at Derby County's Pride Park Stadium, a game which saw two injury-time goals and Arsenal defeat Sunderland 2–1. In the 2009–10 men's season Massey was fourth official in five matches and assistant referee in 11 matches. Her first appointment as an assistant referee was on 29 August 2009, a 2–2 draw between Hereford United and Port Vale.
On 11 February 2010, Massey-Ellis refereed the season's FA Women's Premier League Cup final between Leeds Carnegie and Everton at Rochdale's Spotland Stadium. Massey was required to interpret two notable incidents; she disallowed a third first-half goal for Leeds for a foul on Everton's goalkeeper and disregarded Everton's late first-half appeal for a penalty kick. Leeds won the match 3–1, winning the cup for the first time since its inaugural 1991–92 season.
Massey-Ellis turned professional in March 2010, joining the Professional Game Match Officials Board (PGMOB), who provide the officials for men's Premier League matches, the highest level of professional football in England. Her first Premier League appointment was on 28 December 2010, as an assistant in Blackpool's 2–0 away win at Sunderland.
In August 2011 Massey-Ellis was appointed to the Select Group of match officials.
Massey-Ellis was appointed Member of the Order of the British Empire (MBE) in the 2017 New Year Honours for services to football.
After her second Premier League game, as an assistant in Liverpool's 3–0 win at Wolverhampton Wanderers on 22 January 2011, a sexism controversy erupted over remarks made about Massey-Ellis by staff of the Premier League broadcaster Sky Sports, which led to commentator Andy Gray and presenter Richard Keys being sacked. Reporter Andy Burton was suspended. Massey-Ellis was withdrawn by the PGMOB from her next appointment, a League 2 game between Crewe Alexandra and Bradford City on 25 January, as they believed the added attention Massey might receive could detract from the match itself. The PGMOB also withdrew her for a second time, from a Conference North game between Corby Town and Eastwood Town on 29 January, with Corby stating there had been huge demand for television access when it was announced Massey was to referee the game. Massey returned to the line on 5 February for a League 2 match between Chesterfield and Aldershot Town, and was then appointed to her third Premier League fixture on 12 February between Blackpool and Aston Villa, as an assistant to 2010 World Cup final referee Howard Webb.
Massey's early international career has included involvement in the 2007 FIFA Women's World Cup by taking up the role of fourth official for England's 4–0 qualification stage win over Austria on 20 April 2006. In September 2007 Massey was assistant referee at England Women's 2–1 international friendly defeat by Denmark Women. She was also an assistant referee for the qualification stage of UEFA Women's Euro 2009.
Her involvement in the qualification stage for the Women's World Cup increased for the 2011 edition of the competition, taking up the role of assistant referee for Norway's 2–0 win over Ukraine, Sweden's 1–0 away victory over the Czech Republic in Prague and Belgium's 11–0 home win over Azerbaijan.
She is married to Robert Ellis, himself a football referee.