Henno is both a surname and a given name. Notable people with the name include:
Surname: Hubert Henno (born 1976), French volleyball player Olivier Henno (born 1962), French politician Sass Henno (born 1982), Estonian writer
Given name: Henno Althoff (born 1960), German record producer and recording engineer Henno Haava (born 1973), Estonian runner Henno Jordaan (born 1988), South African cricketer Henno Käo (1942–2004), Estonian children's writer, book illustrator, poet and musician Henno Martin (1910–1998), German geologist Henno Mentz (born 1979), South African rugby union player Henno Prinsloo (born 1987), Namibian cricketer
See also Schlüssel Henno, German World War II hand-cipher system, see Reservehandverfahren Aaron Henneman (born 1980), Australian rules footballer