R42 or R-42 may refer to:

Roads

R42 (South Africa) The R42 is a provincial route (South Africa), provincial route in South Africa that connects Vanderbijlpark with Bronkhorstspruit via Vereeniging, Heidelberg, Gauteng, Heidelberg, Nigel, Gauteng, Nigel and Delmas, Mpumalanga, Delmas. Route The R4 ...

Other uses

R42 (New York City Subway car) The R42 was a New York City Subway car model built by the St. Louis Car Company between 1969 and 1970 for the IND/ BMT B Division. There were 400 cars in the R42 fleet, numbered 4550–4949. It was the last B Division car built for the New York ...

* , a destroyer of the Royal Navy * Junkers R 42, a transport aircraft * R42: May cause sensitisation by inhalation, a risk phrase *

Sidolówka Sidolówka (pron. ''sheedoloofka'') was an unofficial, yet common, name of the R wz. 42 hand grenade, produced by the Polish resistance organization Armia Krajowa in occupied Poland during World War II. The name of the grenade came from Sidol, ...

, a Polish hand grenade *

Spectre R42 The Spectre R42 is a 2-seater mid-engined rear-wheel drive sports car manufactured by British boutique automobile manufacturer Spectre Supersports Ltd. History Ray Christopher, associated with the GT Development firm, which was notable for buil ...

, a British sports car {{Letter-NumberCombDisambig