Back Pioneer H Afrikaans Πάιονηρ Η Greek Pioneer H Spanish Pioneer H Finnish Pioneer H French Pioneer H Italian 파이어니어 H Korean Pioneer H Dutch Pioneer H Portuguese Pioneer H Swedish
Pioneer H was a proposed space probe for the US Pioneer program. If it had been approved, it would have been launched in 1974 and have been designated Pioneer 12; that designation was later applied to the Pioneer Venus Orbiter.