Roger Michael Jacobi (16 February 1947 – 9 December 2009) was a British archaeologist specialising in Palaeolithic and Mesolithic Britain. Known for his encyclopaedic knowledge of British prehistory, Jacobi authored several key synthetic volumes and worked to catalogue, sequence and reanalyse collections from across Britain and northwestern Europe. Sections of his extensive personal archive were posthumously published as the Palaeolithic and Mesolithic Artefact (PaMELA) database. He studied archaeology at Jesus College, Cambridge, and held positions at Lancaster University, the University of Nottingham, and the British Museum.