Marcel Ramon Ponickwar de Souza (born December 4, 1956 in Campinas) is a retired Brazilian basketball player. He played at 4 FIBA World Championships (1974, 1978, 1982, 1990). He totaled 32 games and 399 points during that competitions and won a bronze medal in 1978. De Souza played for Brazil in Olympic Games of 1980, 1984, 1988 and 1992, too.