Cristiano Rositoano Michelena (born March 9, 1971 in Rio Grande do Sul ) is a former international freestyle swimmer from Brazil. He participated in two consecutive Summer Olympics for his native country, starting in 1988. His best result was the sixth place in the Men's 4×100-metre freestyle Relay in Barcelona, Spain.
He was at the 1987 Pan American Games, in Indianapolis. He won silver in the 400-metre freestyle, and bronze in the 4×100-metre freestyle and 4×200-metre freestyle. He also finished 4th in the 1500-metre freestyle, and 6th in the 200-metre freestyle.
At the 1988 Summer Olympics, in Seoul, he finished 10th in the 4×200-metre freestyle, 12th in the 4×100-metre freestyle, 23rd in the 200-metre freestyle, 23rd in the 400-metre freestyle, and 26th in the 1500-metre freestyle.
On April 17, 1989, he broke the short-course South American record in the 400-metre freestyle, with a time of 3:46.39. The record was broken only in the end of 2005, by Armando Negreiros.
At the 1992 Summer Olympics, in Barcelona, he finished 6th in the 4×100-metre freestyle, 7th in the 4×200-metre freestyle, and 21st in the 200-metre freestyle.