Diane Evelyn Caldwell (born 11 September 1988) is an Irish professional footballer who plays as a defender for Reading of the English Women's Super League and the Republic of Ireland national team. Having played in her native Ireland with Raheny United, Caldwell moved to the United States to play collegiately at Hofstra University in 2006. She went on to play in three American leagues: the USL W-League with Hudson Valley Quickstrike, Women's Premier Soccer League with Albany Alleycats and National Women's Soccer League with North Carolina Courage. Caldwell has also played in Iceland for Þór/KA, in Norway with Avaldsnes IL, for German clubs 1. FC Köln and SC Sand, and in England with Manchester United and Reading