Susan Margaret Day MBE (born 29 October 1972) is an English female rugby union footballer who played fullback for London Wasps Ladies and for England.

Sue played in three Rugby World Cups and is England's top try scorer with 61 tries in 59 caps.

Sue or 'Daisy' as she is known to her team mates is the top try scorer in IRB world cups, with 19 tries.

After retiring from 15's, Sue returned to the international game, captaining Simon Amor and Mike Friday's 7's squad to the 7's world cup in March 2009.

[1] She was appointed Member of the Order of the British Empire (MBE) in the 2020 Birthday Honours for services to gender equality in sport.