Giuseppe 'Billy' Reina (born 15 April 1972 in Unna) is a retired German football player. He spent nine seasons in the Bundesliga with Arminia Bielefeld, Borussia Dortmund and Hertha BSC.
For the 2005–2006 season Reina joined Sportfreunde Siegen who at played in the 2. Bundesliga at the time.
- Bundesliga: 2001–02