António Gedeão (b. Rómulo Vasco da Gama Carvalho, GCSE, GOIP; 24 November 1906 – 19 February 1997) was a Portuguese poet, essayist, writer and playwright, who also published several works related to science. António Gedeão was an alter ego of Rómulo de Carvalho, who, using his real name was also a professor, teaching chemistry and history of science.