| Ronaldo Rogério de Freitas Mourão | |
| Birth Date: | 25 May 1935 |
| Birth Place: | Rio de Janeiro |
| Death Place: | Rio de Janeiro |
| Nationality: | Brazilian |
| Occupation: | Astronomer |
| Awards: | Prêmio José Reis de Divulgação Científica (1978/79) |
Ronaldo Rogério de Freitas Mourão (25 May 1935 – 25 July 2014) was a Brazilian astronomer and the founder of the Museum of Astronomy and Related Sciences (Museu de Astronomia e Ciências Afins) (MAST), as well as a researcher and titular partner at the Brazilian History and Geography Institute (Instituto Histórico e Geográfico Brasileiro) (IGHB). He was born and died in Rio de Janeiro.[1]