Siam, an acronym of Sección Industrial de Amasadoras Mecánicas, was founded by Torcuato Di Tella in 1911, and diversified in 1959 into automobile manufacture some time after the founder’s death. Its models were derived from the BMC Farina saloons and estates, principally the Riley 4/68 and MG Magnette Mk III. Financial difficulties saw Siam Di Tella sell to Industrias Kaiser Argentina (IKA), which continued production of the cars until 1967.

• Siam Di Tella 1500
• Riley 1500
• Morris 1650
• MG Magnette Mk III (originally as Siam Di Tella Magnette)
• MG 1650