CH4 most commonly refers to the chemical formula for methane.
CH4 may also denote: a postcode subdistrict of Chester, United Kingdom the CH-4 variant of the Cessna CH-1 Skyhook helicopter the CH-4 variant of the CASC Rainbow unmanned aerial vehicle CH-4, a submarine chaser during World War II Channel 4 (disambiguation) Church Hymnary 4th edition Chandrayaan-4 (CH-4), Moon lander