Gallery of the Masters 
- MacDonald Daniel
- MacDonald Frances
- MacDonald James Edward Hervey
- MacGeorge William Stewart
- Macke August
- Maclise Daniel
- Madrazo y Garreta Raimundo de
- Madrazo y Kuntz Federico de
- Maella Mariano Salvador de
- Maes Nicolaes
- Mägi Konrad Wilhelm
- Magnus Eduard
- Makart Hans
- Makovsky Konstantin Yegorovich
- Malczewski Jacek
- Malevich Kasimir
- Malton James
- Mander, Karel van, the Elder
- Manet Edouard
- Manetti Rutilio di Lorenzo
- Mantegna Andrea
- Manyoki Ádám
- Mařák Julius
- Maratta Carlo
- Marc Franz
- March Estéban
- Marlow William
- Martin David
- Martin Elias
- Martin John
- Martini Simone
- Martorell Bernat
- Masaccio Tommaso de Cassia
- Masolino da Pinacle
- Massys Quentin
- Matejko Jan
- Matteo di Giovanni
- Mazo Juan Bautista Martinez del
- McCubbin Frederick
- McCulloch Horatio
- McNicoll Helen Galloway
- Mednyánszky László
- Meissonier Jean Louis Ernest
- Melbye Vilhelm
- Memling Hans
- Mena Pedro de
- Meneses Osorio Francisco
- Mengs Anton Raphael
- Menzel Adolph Fredrick Erdmann von
- Merritt Anna Lea
- Mesdag Hendrik Willem
- Metrass Francisco Augusto
- Metsu Gabriël
- Michelangelo di Lodovico Buonarroti-
- Micker Jan
- Millais Sir John Everett
- Millet Jean-François
- Modigliani Amedeo Clemente
- Momper Frans de
- Monamy Peter
- Mondrian Piet
- Monet Claude
- Mont Deodat van der
- Montero Don Lorenzo
- Mor van Dashorst Anthonis
- Mora José de
- Morales Luis de
- Moran Thomas
- More Jacob
- Moreau Gustave
- Morland George
- Morphy Garret
- Mostaert Jan
- Mower Martin Thomas
- Moya Pedro de
- Moynan Richard Thomas
- Mu-Qi
- Mucha Alphonse
- Muenier Jules-Alexis
- Mulier the Elder Pieter
- Mullins George
- Mulready William
- Mulvany John George
- Munch Edvard
- Munier Émile
- Munkácsy Mihály
- Murillo Bartolomé Esteban
- Mytens Johannes