The USS Adelphi (NCC-26849) was an Ambassador-class starship in service during the mid-24th century. Captain Darson was her commanding officer during the Ghorusda Disaster, a disastrous first contact with the Ghordusans costing 47 crew lives, including Darson's. After an investigation into the matter, Starfleet found Darson ignored Ghordusan cultural taboos, causing the disaster. (TNG: "Tin Man")