Fabio Ongaro (born 23 September 1977 in Venice) is an Italian rugby union footballer.

Ongaro first played for Rugby Casale (1994/95-1997/98), spending the most prolific time of his career at Benetton Treviso (1998/99-2005/06), where he won 5 Italian Championships (1998/99, 2000/01, 2002/03, 2003/04 and 2005/06), a Cup of Italy (2004/05) and a Supercup (2006).

His rise to the top peaked in November 2004 when he was named as Italy captain in place of the injured Marco Bortolami.

[3] In 2003 Ongaro, alongside fellow international Gianluca Faliva, had been accused of having made use of Epoetin beta (NeoRecormon) for doping purposes.

[4][5] In 2009 the trial was concluded with a sentence of absolution for Faliva and Ongaro, as no proof of either of them using or detaining the doping substance could be presented.