Morris Lyon Marks (7 September 1824 – 4 March 1893) was a Jewish immigrant to Australia remembered as a politician in the colony of South Australia.
A son of Lyon Marks ( – ) and Mrs. Marks (ca.1783 – 5 February 1857), he and his brother Solomon Lyon Marks migrated from London to South Australia on the Abberton, arriving in December 1846, and was a successful importer and merchant in Adelaide and Burra. He was, in 1848, a member of the consortium (with Burnet Nathan, Louis Hart, Joseph Hart, and Samuel Hart) who purchased from George Morphett land on Rundle Street for the first Synagogue (consecrated 3 September 1850). He married in 1850 and later had a large family.
He was elected to the South Australian House of Assembly, representing The Burra and Clare from March 1857 to August 1858, when he resigned in order to make a trip to Europe. On his return he continued his business, but did not stand for re-election. He spent some time alternating between New Zealand and Melbourne.
He and his family left for New Zealand to live, and were resident in Wellington, New Zealand, in 1883, then returned to Australia, living in Albert Park, Victoria, where he died on Saturday, 4 March 1893.
Marks married Leah Solomon (ca.1832 – 9 August 1908), sister of Judah Moss Solomon, on 30 January 1850. Their children were