Danks
    1914-1918
    Frederick Danks
    Oldsbury, Worcestershire

Daimler-Reanrd
    1908-n. 1910
    Daimler Motor Co Ltd
    Coventry

Davey-Paxman
    1905-1908
    Davey, Paxman & Co Ltd
    Colchester, Essex

David Brown
    1936-n. 1956
    David Brown Tractors Ltd
    Meltham, Huddersfield

Dearne
    1927-1935
    Reynolds Bros (Barnsley) Ltd
    Yorkshire

Dennis
    1904-
    John and Raymond Dennis
    Guildford, Surrey

Dennis/Mann-Egerton
    1954
    Mann-Egerton Ltd
    Norwich, Norfolk

Dennis-Mercury
    1964-1972
    Mercury Truck & Tractor Co Ltd
    Cloucester

Dennis-Portland
    1923
    Dennis Bros Ltd
    Guildford, Surrey

Dennis-Stevens
    n. 1918
    Stevens' Petrol Electric Vehicles Ltd
    Lontoo

Diesel
    n. 1931
    British Mercedes-Benx Ltd

DJB
    1973-
    DJB Engineering Ltd
    Peterlee, Co Durham

Dodge (I)
    1933-
    Dodge Bros (Britain) Ltd
    Kew, Surrey

Douglas (II)
    1947-
    F L Douglas Equipment Ltd
    Cheltenham, Glostershire

Douglas-ACM
    1946-1952
    Douglas (Kingswood) Ltd
    Kingswood, Bristol

Duplex (I)
    1907
    Cuplex Motor Engine Co
    Lontoo

Durham-Churchill
    1905-1914, 1918-1925
    Durham, Churchill & Co
    Attercliffe, Yorkshire