Jayme Tiomno (April 16, 1920 in Rio de Janeiro – January 12, 2011 in Rio de Janeiro) was a Brazilian experimental and theoretical physicist with interests in particle physics and general relativity. He was member of the Brazilian Academy of Sciences and a recipient of the Brazilian Order of Scientific Merit. He was the son of Jewish Russian immigrants.
He was a founder of the CBPF - Centro Brasileiro de Pesquisas FÃÂsicas (Brazilian Center of Physics Research) and one responsible for the creation of the Brazilian Physical Society.