| Cássio | |
| Fullname: | Cássio Alessandro de Souza |
| Birth Date: | 8 July 1986 |
| Birth Place: | Porto Alegre, Brazil |
| Position: | Centre back |
| Currentclub: | Avaí |
| Years1: | 2005–2007 |
| Caps1: | 0 |
| Goals1: | 0 |
| Clubs1: | RS Futebol |
| Years2: | 2005–2007 |
| Caps2: | 1 |
| Goals2: | 0 |
| Clubs2: | → Juventude (loan) |
| Years3: | 2007 |
| Caps3: | 17 |
| Goals3: | 0 |
| Clubs3: | → Avaí (loan) |
| Years4: | 2008–2010 |
| Caps4: | 0 |
| Goals4: | 0 |
| Clubs4: | Desportivo Brasil |
| Years5: | 2008 |
| Clubs5: | → Avaí (loan) |
| Years6: | 2009–2010 |
| Caps6: | 15 |
| Goals6: | 0 |
| Clubs6: | → Fluminense (loan) |
| Years7: | 2011–2012 |
| Caps7: | 26 |
| Goals7: | 1 |
| Clubs7: | Avaí |
| Years8: | 2013 |
| Caps8: | 0 |
| Goals8: | 0 |
| Clubs8: | Guarani |
| Years9: | 2013 |
| Caps9: | 0 |
| Goals9: | 0 |
| Clubs9: | Fortaleza |
| Years10: | 2013 |
| Caps10: | 8 |
| Goals10: | 0 |
| Clubs10: | ASA |
| Years11: | 2014 |
| Caps11: | 0 |
| Goals11: | 0 |
| Clubs11: | Comercial |
| Years12: | 2014– |
| Caps12: | 0 |
| Goals12: | 0 |
| Clubs12: | Avaí |
| Club-Update: | 30 November 2014 |
Cássio Alessandro de Souza (born 8 July 1986), simply known as Cássio, is a Brazilian footballer who plays for Avaí as a central defender.
Born in Porto Alegre, Rio Grande do Sul, Cássio was signed by RS Futebol in December 2004 along with his twin brother Rafael. They signed a 5-year contract. In March 2005 they were loaned to Juventude in 3-year contract.[1] Cássio made his Brazilian Série A debut on 26 October 2006. In June 2007 he was loaned to Avaí in 2-year deal, which Rafael already arrived in March. After a season with Avaí at Série B, he was signed by Traffic Group as an investment (through subsidiary Desportivo Brasil) and loaned back to Avaí in -year deal. In 2008 the team finished as the third and promoted. Traffic Group then loaned him to Série A side Fluminense, another club partner, in 2-year deal.[2] He only played 15 Série A games in 2 seasons. However, he also played in 2009 Copa Sudamericana final first leg.
In February 2011 he returned to Avaí in 2-year deal[3] [4] as his twin brother transferred to Europe. It was reported that Avaí held some rights and Traffic held 40% before the transaction.[5]