D18 may refer to: D-18 guitar , a Cannon-class destroyer escort of the Brazilian Navy Darmstadt D-18, a German sportsplane Dublin 18, a postal district in Ireland , a County-class destroyer of the Royal Navy , an Attacker-class escort carrier of the Royal Navy , a Battle-class destroyer of the Royal Navy Jodel D18, a French ultralight aircraft LNER Class D18, a steam locomotive class Progress D-18, a turbofan engine