Alexandra Greenfield (born 1990) was a Welsh road and track cyclist from Barry. She began competing at a young age with the Maindy Flyers children's cycle club before joining . Greenfield holds the record for the 5 km Tandem Standing Start event on the track along with Katie Curtis, with a time of 7 minutes 4.424 seconds. The record was set in Newport Velodrome on 10 June 2004. She transitioned from Wiggle High5's former technical director and assistant directeur sportif, to be Cycling New Zealand's women's endurance assistant coach by mid-2018.