María Isabel Moreno Allue (Maribel Moreno) (born 2 January 1981) is a Spanish road bicycle racer from Ribes de Freser, Girona.
Moreno was due to compete in the Women's road race at the 2008 Summer Olympics in Beijing on 10 August, but did not start having been tested positive for EPO. Moreno arrived in Beijing on 31 July and was immediately tested. She fled the country for Spain that same day, having suffered a panic attack. The positive test results were announced on 11 August, making Moreno the first athlete to test positive for a banned substance at the 2008 Olympic Games.