(→Variants: add engine link)
;HO4S-1: US Navy version of the H-19A, 10 built.
;H04S-2: Project for rescue version for the United States Coast Guard, not built.
;H04S-3: Re-engined US Navy & Canadian version with 700hp R-1300-3 engine, redesignated UH-19F (American variant) H04S-3 (Canadian variant) in 1962, 79 built.
;HO4S-3G: United States Coast Guard version of the HO4S-3, redesignated HH-19G in 1962, 30 built.
;HRS-1: United States Marine Corps version of the HO4S for eight troops, 60 built.