- Martyn, Thomas, 1735-1825, surveyor1
- Metropolitan Railway (London, England)1
- Middleton, M., cartographer1
- Newcourt, Richard, -1679, cartographer1
- Ogilby, John, 1600-16761
- Ogilby, John, 1600-1676, cartographer1
- Ogilvy, Catherine1
- Oliver, John, 1616-1701, cartographer1
- Oliver, John, 1616-1701, cartographer, engraver1
- Osborne, Edward Cornelius, creator1
- Phelps, William Lyon, 1865-1943, cartographer1
- R. Mount and T. Page, cartographer, bookseller1
- Railway Clearing House, cartographer1
- Raisz, Erwin, 1893-1968, cartographer1
- Ramsay, A. C. (Andrew Crombie), 1814-18911
- Ramsay, A. C. (Andrew Crombie), 1814-1891, cartographer1
- Rapkin, J.1
- Ravenstein, Ernst Georg, 1834-1913, cartographer1
- Richard Jackson (Firm), cartographer, publisher1
- Rocque, John, -1762, cartographer1
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