Ana Carolina de Castro Muniz (born March 14, 1984) is a freestyle swimmer from Brazil.

[1] At the 1999 Pan American Games in Winnipeg, she won the bronze medal in the 4×200-metre freestyle.

[3] In November 1999, she broke the short-course South American record of the 200-metre freestyle, with a time of 2:01.09.

[6] At the 2000 FINA World Swimming Championships (25 m), in Athens, Muniz finished 9th in the 4×200-metre freestyle,[7] where she broke the South American record, with a time of 8:18.87, along with Monique Ferreira, Tatiana Lemos and Paula Baracho.

[12] She won the silver medal in the women's 4×200-metre freestyle relay at the 2003 Pan American Games in Santo Domingo, Dominican Republic,[13] where she broke the South American record, with a time of 8:10.54, along with Monique Ferreira, Mariana Brochado and Paula Baracho.