David Sierra Manzanares (born 16 September 1983) is a Spanish soccer player who plays as a goalkeeper.

In the 2004 summer Sierra first arrived in Segunda División B, signing with SD Ponferradina; he eventually appeared four times in his first two seasons combined, the being promoted in the second.

On 20 September 2006 Sierra made his professional debut, starting in a 0–1 away loss against Elche CF, for the season's Copa del Rey.

[1] His Segunda División debut came on 3 June of the following year, in a 0–4 away loss against CD Castellón;[2] he eventually played the other two matches, with Ponfe already relegated.

In March 2010 Sierra moved abroad for the first time of his career, signing with Bayamón FC, appearing in that year's CFU Club Championship, eventually finishing fourth and missing out the CONCACAF Champions League.