| Abelmann, W. and R. | unk. | 127 |
| Adenauer, K. | Germany | 376 |
| Agnew, Th. | United Kingdom | 1012 |
| Agnew-Somerville | United Kingdom | 707 |
| Albemarle | unk. | 139 |
| Altamira | Spain | 358 |
| Archduke Leopold Wilhelm of Austria | Austria | 989 |
| Argoutinsky-Dolgoroukoff, Prince W. | Russia | 590 |
| Armitage, Rev. F. W. | unk. | 280 |
| Art Collectors' Association Ltd | United Kingdom | 363 |
| Babinet, A. | France | 92 |
| Beck, Dr. H.U. | Germany | 1 633 |
| Becker | Belgium | 361 |
| Bernat, Mr. & Mrs. E. | United States | 1 387 |
| Bijl, H.R. | Netherlands | 612 613 644 |
| Blasberg | unk. | 362 |
| Bloch, V. | unk. | 23 |
| Bode, W. von | Germany | 90 |
| Bohn (?), H. G. | unk. | 576 |
| Bonnefantenmuseum | Netherlands | 357 |
| Bourgevin Vialart de Saint-Morys, Ch. | France | 593 |
| Bowes, J. | United Kingdom | 59 |
| Boysen, Dr. H. | Germany | 475 |
| Brady, Sir M. | United Kingdom | 71 72 |
| Brandes, W. | Germany | 854 |
| Braschi, Prince | Italy | 58 |
| Bredius, A. | Netherlands | 69 |
| Bührle Foundation | Switzerland | 283 |
| Buma, C.W. | France | 243 |
| Calendo, E. | France | 592 |
| Campe, H. W. | unk. | 927 |
| Cankrie, J. Ch. | United Kingdom | 60 |
| Cavens, Comte | Belgium | 471 |
| Chantre, M. E. | Switzerland | 478 |
| Charles III of Spain | unk. | 1011 |
| Charles Theodor, Prince-Elector of Bavaria | unk. | 993 |
| Château Mazarin (Rethel) | France | 809 |
| Chesham, Lord | United Kingdom | 44 |
| Convento de San Francisco, Burgos | Spain | 776 777 778 779 923 1013 |
| Conzen, F.G. | Germany | |
| Cook, Sir F. | United Kingdom | 1007 |
| Cracherode, Rd. C. M. | United Kingdom | 773 |
| Crespi, B. | Italy | 986 |
| d'Aremberg, Prince Ch. | Belgium | 50 |
| d'Udekem d'Acoz, P. | Belgium | |
| Davies, R. | United Kingdom | 551 |
| Davison, G.W. | United States | 694 734 911 |
| de Bourguignon de Fabregoules | France | 481 |
| de Burtin, Chevalier Fr.-X. | Belgium | 515 |
| de Callataÿ, E. | Belgium | 53 67 368 |
| de Grez, Douairière | Belgium | 547 548 549 656 |
| de Halleux, A. | Belgium | 344 347 354 |
| de Lacaze, Marquis | France | 835 |
| de Loën d'Enschedé | Belgium | 56 |
| de Madrazo, Don Luis | unk. | |
| de Montmorency | unk. | 227 |
| de Pass, A. | South Africa | 108 |
| de Rothschild, K. | United Kingdom | |
| de Salamanca, M. | Spain | 776 777 778 779 923 1013 |
| de Silguy, Comte J.-M. | France | 94 95 97 99 100 |
| Degroof Bank | Belgium | 765 |
| Deiker | Germany | 648 |
| Delaroff, P. | Russia | 243 |
| Dellis, Ph. | Belgium | 860 |
| Dowland, K. | unk. | 621 |
| du Roi-Mariette | France | |
| du Roy de Blicquy | Belgium | 20 |
| Dugdale, W. | United Kingdom | 470 |
| Dulière | Belgium | 43 133 360 |
| Dyce, A. | United Kingdom | 572 |
| Elend, Mrs. | Israel | 490 |
| Errera | Belgium | 612 |
| Escudero | unk. | 103 |
| Esdaile, W. | United Kingdom | 556 |
| Ewing, J. | unk. | 5 28 |
| Facklan, M. | Switzerland | 655 |
| Farnese, I. | Spain | 1011 |
| Féijo | unk. | 109 |
| Fenwick, Sir TH.F. | United Kingdom | 573 576 |
| Ferdinand VII of Spain | unk. | 1011 |
| Fernandez Duran, P. & de Quiros, B. | Spain | 84 85 |
| Fondation van Caloen | Belgium | 583 |
| Frölich | Germany | 26 27 |
| Fuller-Maitlant, Mrs. J.A. | United Kingdom | 577 |
| Funk, B. | Germany | 622 628 |
| Gigoux, J. | France | 666 |
| Goldsmith, W. S. | unk. | 342 |
| Gramberg, Dr. W. | Germany | 645 |
| Grambs, J. G. | Germany | 559 |
| Grieten, G. | Belgium | 662 |
| Gripenstedt, J. | Sweden | 762 |
| Grossman, A. | unk. | 113 |
| Grubb, P.W. | Sweden | 25 |
| Guffanti | Germany | 112 |
| Hamilton, I. | United Kingdom | 28 |
| Harris, T. | United Kingdom | 647 |
| Hartog | Germany | 467 |
| Harvey, W. | United Kingdom | 60 |
| Harzen, G.E. | Germany | 560 561 749 750 838 839 840 |
| Helbing | Germany | 484 |
| Hendrickx | Netherlands | 349 |
| Het Kasteel van Loppem - Stichting Jean van Caloen | Belgium | 984 |
| Holzhausen | unk. | 29 |
| Hoogewerff, Prof. Dr. G. J. | Netherlands | 503 504 |
| Hoser, Dr. J. | Czechia | 93 |
| Hotel Royal Savoy | Switzerland | 356 |
| Hottinger, Baron H. | France | 294 295 |
| Houlditch, R. | unk. | 773 |
| Hulin de Loo | Belgium | 162 |
| Humphrey of Traford, Sir | United Kingdom | 1012 |
| Ingram, Sir B. | United Kingdom | 551 951 |
| Jalles | unk. | 606 |
| Jasper | Germany | 562 563 |
| Jüngeling, H. | Netherlands | 509 |
| Kaunitz-Rietberg, Prince | Austria | 755 756 |
| Kay, A. | unk. | 364 |
| Kerrich, Rev. E. | United Kingdom | 550 |
| Kerrich, T. | United Kingdom | 550 |
| Khanenko | unk. | 79 |
| Knight, F.W.A. | unk. | 595 |
| Knight, H.M. | Netherlands | 660 |
| Knowles, W.P. | Netherlands | 584 |
| Koenig | unk. | 673 |
| Koenigs | unk. | 949 |
| Komor, L. | unk. | 264 |
| Krebs, J. | Belgium | 133 |
| Kronig, J.O. | Netherlands | 297 |
| Künze-Gräfe, C. | unk. | 912 |
| La Caze | France | 101 |
| Lagrenée | France | 673 |
| Laing, D. | United Kingdom | 556 557 |
| Landesmuseum Mainz | unk. | 929 |
| Langstadt, E. | Germany | 341 |
| Lanz, G.B. | Switzerland | 488 |
| Laurentius, F. | Netherlands | 847 |
| Lawrence, Sir Th. | United Kingdom | 573 673 |
| Ledger, W.E. | United Kingdom | 608 |
| Leroux, H. | France | 359 |
| Leslie-Smith, L. | United Kingdom | 176 |
| Lucas, W.H.A.M. | Netherlands | 157 |
| Lugt, Fr. | France | 22 592 893 |
| Madan, F.F. | United Kingdom | 944 |
| Madrazo, Don Luis de | Spain | 358 |
| Malaise, M. | Belgium | 379 |
| Marcus | Belgium | 20 |
| Mariette, P.-J. | France | 591 849 |
| Mark | unk. | 633 |
| Massarenti, Don M. | Italy | 462 |
| Mathew, R.G. | unk. | 850 |
| Mayring, V.J. | Germany | 477 |
| McLellan,, A. | United Kingdom | 110 |
| Mellaart, J.H.J. | unk. | 370 |
| Mellart | Netherlands | 133 |
| Mennens, G. | Belgium | 382 |
| Mesnard, L. | France | 68 605 |
| Metternich-Winnebourg, Princess | Austria | 137 |
| Michaelson | unk. | 114 |
| Mosolov, N. S. | Russia | 584 585 |
| Mouriau, A. | Belgium | 751 |
| Müller, C. | unk. | 925 |
| Museum het Spaans Gouvernement | Netherlands | 357 |
| Musker, R. | unk. | 170 |
| National Loan Collection Trust | United Kingdom | 60 |
| Nieuwenhuys, C.J. | unk. | 71 72 |
| Norberg, G. | Sweden | 39 |
| Normand, A. | France | 621 |
| Normand, N. | France | 621 |
| Northumberland, Duke of | United Kingdom | 336 |
| Offenheim | Austria | 5 |
| Oppé, P. | United Kingdom | 636 637 |
| Otto, C. | unk. | 844 |
| Otto, E.J. | unk. | 644 |
| Pastrana | Spain | 358 |
| Payne-Knight, R. | United Kingdom | 574 |
| Pecqueur-Defossez | France | 105 |
| Peltzer, R. | unk. | 844 |
| Perman, Prof. E. | Sweden | 565 |
| Petercam | Belgium | 54 |
| Pfeiffer, P. | United Kingdom | 820 |
| Philippi, L.H. | unk. | 844 |
| Philippsohn, Mr. & Mrs. S. | United States | 646 |
| Phillipps, Sir Th. | United Kingdom | 573 576 |
| Picker | Netherlands | 664 |
| Polakovits, M. | unk. | 914 |
| Polotsev, A.A. | Russia | 586 |
| Porkay, M. | Hungary | 480 487 |
| Posselt, E.C.L. | Germany | 692 |
| Prehn, J.V. | Germany | 743 |
| Racapé, J.H. | France | 260 |
| Reed, M. | United Kingdom | 186 |
| Rhodin, C.Fr. | Germany | 749 |
| Rochlitz | Germany | 483 |
| Roesler | United States | 5 |
| Rothan | France | 103 |
| Rothschild, Dr. D. | unk. | 127 |
| Royal Scottish Academy | unk. | 556 557 |
| Royale Belge | Belgium | 258 |
| Rudolf, C.R. | unk. | 850 |
| Rumillies Castle | Belgium | 346 |
| Rumohr | Germany | 830 |
| Rupert de Chièvre, F. | France | 473 |
| Russel, W. | Netherlands | 111 |
| Rutley, Th. R. | United Kingdom | 60 |
| Saam, Dr. G. | Germany | 513 |
| Sandby, P. | United Kingdom | 838 947 |
| Sandizell, The Counts | Germany | 270 507 |
| Schloss, A. | France | 137 |
| Schmidt | France | 104 |
| Schneider, Dr. H. | unk. | 472 |
| Schubart | Germany | 111 |
| Schutz | United States | 942 |
| Seilern, Count A. | United Kingdom | 573 576 |
| Semenov-Tian-Chansky | Russia | 24 |
| Semyonovich Mosolov, N. | Russia | 584 585 |
| Sharp, W. | United Kingdom | 621 |
| Sherlock, Mrs. E. | United States | 47 |
| Singer, J. | United Kingdom | 138 |
| Société des Antiquaires de l'Ouest | France | 473 |
| Société Générale de Banque | Belgium | 1012 |
| Spengler, C. | Denmark | 749 |
| Sperling, H.G. | unk. | 943 |
| Spicer, Captain F.F.F. | United Kingdom | 184 187 |
| Springell, Dr. F. | United Kingdom | 626 |
| Squire, W.B. | United Kingdom | 577 |
| Städel und Hausmann | Germany | 534 |
| Steiner | United Kingdom | 597 |
| Stenman, G. | Finland | 39 293 |
| Stieglitz | Russia | 586 |
| Stüve, G. | Germany | 90 |
| Stuyck del Bruyère | Belgium | 20 |
| Sutherland, Duke of | United Kingdom | 513 |
| Sutton, D. | unk. | 139 |
| Tacklaur, M. | Switzerland | 655 |
| Tencé | France | 83 |
| The Leonora Hall Gurley Memorial Collection | unk. | 981 982 |
| Tollemache, Lord | unk. | 456 |
| Tschager, J. | Austria | 755 756 |
| van de Velde van Zuylen, E. | Belgium | 56 |
| van Eeghen, Chr. P. | Netherlands | 639 |
| Van Leeuwen, H. | Netherlands | 609 664 |
| Van Parijs | unk. | 541 |
| Vaudalin-Moriszech | unk. | 20 |
| Vischer-Staehelin | unk. | 342 |
| von Bartolani, K. | Austria | 93 |
| von Beckerath | Germany | 533 535 536 540 541 824 825 826 829 |
| von Blücher, C.W. | Germany | 562 563 |
| von Braunschweig, Archiduc | Germany | 283 |
| von der Hellen, G. | Argentina | 749 |
| von der Hellen, W. | Germany | 749 |
| von Guttman | unk. | 621 |
| von Hohenzollern-Hechingen, Prince | Germany | 283 |
| von Liphart, K.E. | Estonia | 622 628 |
| von Rollhausen, Baron R. | Germany | 283 |
| von Sachsen-Teschen, Herzog A. | Austria | 599 600 602 603 604 717 |
| Walters, H. | United States | 462 |
| Ward, R.H. | France | 372 |
| Warneck | unk. | 32 |
| Wasserman, M. | France | 111 |
| Wassermann, R. von | Belgium | 761 |
| Wauters, E. | Belgium | 187 302 |
| Welcker, Dr. A. | Netherlands | 568 |
| Wernker, Sir H. | United Kingdom | 22 |
| West, H. | unk. | 80 |
| Wildman | United States | 5 28 |
| Willard, T.P. | Belgium | 633 |
| Williams, M.A. | France | 102 |
| Witt, Sir R. | United Kingdom | 578 579 580 581 582 641 |
| Wolf, E. | unk. | 621 |
| Woodburn, S. | United Kingdom | 573 576 |
| Zanchi | Switzerland | 373 |
| Zaugg-Gramm, W. & L. | Switzerland | 498 |
| Zenner, Dr. F. | Belgium | 76 |
| Zschille | Germany | 112 |
| zu Hohenzollern-Hechingen, Fürst | Germany | 111 |