Rossant is a surname of English, Welsh, and French origins.
Notable people with the surname include:
Colette Rossant (born c. 1930s), French-American food writer
James Rossant (1928–2009), American architect, urban designer, and artist
Janet Rossant (born 1950), British developmental biologist
John Rossant (born 1955), American public relations executive
Juliette Rossant, American writer
Lorrie Rossant, 20th Century British architect and co-founder of the Building Design Partnership
Murray Rossant (1925-1988), American journalist and head of The Century Foundation
Tomas Rossant, American architect