Petra Zammit (born 11 August 1987) is a blues singer from San Ġwann, Malta who was raised in Żejtun.
Her first public appearance was the Malta Song for Europe 2008 with the song Streetcar of Desire written by Elton Zarb and Rita Pace. The song made it to the final 8 on Saturday 26 January 2008.
In 2009 she won the first edition of the Academy Show produced by Grace Borg on One TV. Thea Garrett and Rhiannon Micallef tied in second place. 
Petra took part in the Malta EuroSong 2010 final on Saturday 20 February 2010, singing All I Need with music by Andrew Zammit and lyrics by Keith Zammit.
On Saturday 5 December 2010, Petra won second place in L-Għanja tal-Poplu 2010 with the song Rakkont ta’ Omm composed by Heathcliff Balzan with lyrics by Deo Grech. The song lyrics were also awarded the prize for Best Social Theme.