Linda Melanie Villumsen Serup (born 9 April 1985 in Herning) is a Danish-born road racing cyclist who became a New Zealand citizen in 2009 and has ridden under a Kiwi licence from 2010.
She won the European under 23 time trial championship in 2006 and 2007.
She was Danish national champion in both road racing and time trialing in 2006, 2008 and 2009. In 2006, Cycling World named her their Cyclist of the Year.
At the 2008 Summer Olympics in Beijing she finished 5th in the women's road race and 13th in the time trial.
At the 2012 Summer Olympics in London she finished 18th in the road race and fourth in the time trial, missing out on a medal by less than two seconds.
Villumsen won the Route de France Féminine in 2006 and 2013.
From 2008 to 2014 she placed 10th, 3rd, 3rd, 2nd, 3rd, 2nd and 9th in world championships time trials.
From 2012 to 2014 she placed 7th, 6th and 8th in world championships road races.