Cyro Marques Delgado (born 11 May 1961 in União da Vitória) is a Brazilian former freestyle swimmer.

[3] At the 1980 Summer Olympics, in Moscow, he won a bronze medal in the 4×200-metre freestyle relay, with a time of 7:29.30, along Jorge Fernandes, Marcus Mattioli and Djan Madruga.

[1] In the 4×100-metre medley, he broke the South American record at heats, with a time of 3:53.32, helping Brazil to reach the final.

[7] At the 1984 Summer Olympics, in Los Angeles, his best achievement was ninth place in the same 4×200-metre freestyle relay event.

[9] After retirement from swimming he took leading positions in Brazilian sports management, such as president of State Council of Sports (Conselho Estadual de Desportos), president of Committee of Sports Projects (Comissão de Projetos Esportivos Incentivados) and president of the National Olympics Committee (Comissão de Atletas Olímpicos).