Siobhan Rebecca Chamberlain (born 15 August 1983) is an English football goalkeeper who plays her club football for FA WSL club Arsenal Ladies. She has represented the England women's national football team on more than 25 occasions since her debut in 2004.
In October 2010, Chamberlain returned to Bristol Academy ahead of their inaugural FA Women's Super League campaign. She helped Bristol reach the FA Women's Cup final, played in the UEFA Women's Champions League and was named in the WSL team of the season. In April 2012 she was appointed as one of eight digital media ambassadors, one from each team, who wear their Twitter account name on their shirt sleeves to raise the profile of the WSL.
In December 2013 Chamberlain quit Bristol Academy to sign a two-year contract with Arsenal, where she would rival the incumbent goalkeeper Emma Byrne for a starting position. Chamberlain had played every minute of every game in her three seasons back at Bristol, but craved a new challenge: "My ambition is to be England's number one so the added competition at Arsenal is what I need at this point in my career."
Chamberlain progressed through the youth ranks with England before making her senior debut against the Netherlands in September 2004. She won her second cap in a record 13–0 win against Hungary and her third against Sweden in Cyprus.
Chamberlain joined the National Player Development Centre at Loughborough University when she was 18, training every day while earning a degree in sports science and a masters degree in sports nutrition. She was later employed as a lecturer / coach by South Gloucestershire and Stroud College in Bristol.