Jaime Nielsen (born 3 September 1985) is a New Zealand track and road cyclist, and a former representative rower.

She became world champion at the World Rowing U23 Championships in Poznań, Poland, in 2004 with the U23 women's quadruple sculls with fellow members Bess Halley, Darnelle Timbs and Fiona Paterson.

At the 2020 Summer Olympics, she finished eighth, in Women's team pursuit.

[5][6] In 2017 she broke the sea level world record for the one-hour ride in Cambridge.

She clocked 47.791kms in the hour which was 909m more than the previous world's best at sea level.