Cacalo
- Birthday: 1950-08-27
- Place of birth: Porto Alegre, Rio Grande do Sul, Brazil
- Also know as: Luiz Carlos Silveira Martins
Luiz Carlos Pereira Silveira Martins, better known as Cacalo, (Porto Alegre, August 27, 1950), is a lawyer, broadcaster and Brazilian sports director. He was president of the Grêmio Foot-Ball in the 1997-1998 biennium.
