L.S.D. war eine britische Automarke.
Das Unternehmen Sykes & Sugden Limited aus Huddersfield begann 1920 mit der Produktion von Automobilen. 1923 erfolgte eine Umbenennung in L.S.D. Motor & Co Limited und der Umzug nach Mirfield in West Yorkshire. Der Name L.S.D. steht für Longbottom (Designer), Sykes (Hersteller) und Dyson (Buchhalter). 1924 endete die Produktion.
Das einzige Modell war ein Dreirad, bei dem sich das einzelne Rad hinten befand. Ein luftgekühlter V2-Motor von J.A.P. wurde vorne im Fahrgestell montiert.
Ein Fahrzeug dieser Marke ist im Tolson Memorial Museum in Huddersfield zu besichtigen, ein anderes in der Louwman Collection in Den Haag.
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