| Sidnei | |
| Fullname: | Sidnei Siqueira Lourenço |
| Height: | 1.730NaN0 |
| Birth Date: | 29 June 1983 |
| Position: | Left Back |
| Youthyears1: | 2000–2001 |
| Years1: | 2001–2002 |
| Years2: | 2003 |
| Years3: | 2004 |
| Years4: | 2005 |
| Years5: | 2005–2006 |
| Years6: | 2006–2007 |
| Years7: | 2007–2008 |
| Years8: | 2007 |
| Years9: | 2008 |
| Years10: | 2008 |
| Years11: | 2009 |
| Years12: | 2009 |
| Years13: | 2010 |
| Years14: | 2010 |
| Years15: | 2011 |
| Years16: | 2011 |
| Years17: | 2012– |
| Clubs2: | → Juventus-SP (Loan) |
| Clubs8: | → CRB (Loan) |
| Clubs9: | → Portuguesa (Loan) |
| Clubs10: | → Criciúma (Loan) |
| Caps1: | 7 |
| Caps2: | 6 |
| Caps4: | 3 |
| Caps9: | 5 |
| Caps12: | 4 |
| Caps14: | 2 |
| Caps16: | 7 |
| Goals1: | 0 |
| Goals2: | 0 |
| Goals4: | 0 |
| Goals9: | 0 |
| Goals12: | 0 |
| Goals14: | 0 |
| Goals16: | 0 |
Sidnei Siqueira Lourenço or simply Sidnei (born June 29, 1983 in São José do Rio Pardo), is a Brazilian left back. He currently plays for Santa Cruz.