H2S is the chemical formula of hydrogen sulfide. H2S may also refer to: Dynali H2S, a Belgian helicopter design H2S radar, the first airborne ground-mapping radar, used during World War II How to Succeed in Business Without Really Trying (book), a 1952 book written by Shepherd Mead and the inspiration for the musical of the same name. How to Succeed in Business Without Really Trying (musical), a 1961 musical adapted by Frank Loesser with Abe Burrows, Jack Weinstock, and Willie Gilbert H2S, a Canadian postal code area in La Petite-Patrie, Montreal, Quebec