- Oliver, Paul M.
- Oliver, Pedro Pablo Herrera
- Oliver, R. W.
- Oliver, Robert Wayne.
- Oliver, Royce L
- Oliver, Samuel Pasfield, 1838-1907
- Oliver, Thomas
- Oliver, W E B
- Oliver, W L R
- Oliver, W R B
- Oliver, W.H.
- Oliver, Walter Reginald Brook, 1883-1957
- Oliver, William A
- Oliver, William F., Jr.
- Olivera Galvez, Alfredo
- Olivera González, Percy
- Olivera, Alfredo
- Olivera, B M
- Olivera, Baldomero M
- Olivera, Daniel E
- Olivera, M A
- Olivera, Nelda L
- Olivera-Ávila, Carlos
- Olivera-Gálvez, Alfredo
- Olivera-Gàlvez, Alfredo
- Olivera-Gómez, León David
- Olivera-Morales, Diego
- Oliveras de Ita, Adán
- Olivereau, Madeleine
- Oliveria, F L
- Oliveria-Pereira, Maria Inêz de
- Oliverio, M
- Oliverio, Marco
- Olivero, Eduardo B.
- Olivero, Paola A
- Oliveros, Carl H.
- Olivetti, G
- Olivi, Giuseppe, 1769-1795
- Olivia De Cardelli (Firm),
- Olivier, A
- Olivier, Alain
- Olivier, Anthony
- Olivier, E
- Olivier, Ernest
- Olivier, Ernest, 1844-1914
- Olivier, François
- Olivier, G. A. (Guillaume Antoine), 1756-1814
- Olivier, Georges
- Olivier, Guy
- Olivier, Henri-Jacques-François
- Olivier, J M
- Olivier, M C
- Olivier, M Louis
- Olivier, Marie-Jose
- Olivier, Renan S.
- Olivieri, A M
- Olivo, C
- Olivo, Murielle Andreo
- Olivo-Del Amo, Rosa
- Olivos-Ortiz, Aramis
- Olkinuora, Pia
- Olkowski, H
- Olkowski, W
- Olla, Bori L
- Ollgaard, Benjamin
- Ollier, C D
- Olliff, Arthur Sidney, 1865-1895
- Ollivier, Mélodie
- Ollman, Joe.
- Ollsen, John Dewey, 1899-
- Olmati, Cristina
- Olmedo, M. Isabel
- Olmedo, Maria Isabel
- Olmer, D.
- Olmi, M
- Olmi, M.
- Olmi, Massimo
- Olmo, H. P. (Harold Paul), 1909-2006
- Olmos Lau, Vania
- Olmos, F
- Olmos, Fabio
- Olmos, Viviana
- Olmos-Soto, J
- Olmstead, C A
- Olmstead, K L
- Olmstead, R
- Olmstead, Richard G.
- Olmsted Brothers.
- Olmsted, Frederick Erskine, 1872-1925
- Olmsted, Frederick Law, 1822-1903
- Olmsted, Frederick Law, 1870-1957
- Olmsted, Olmsted, and Eliot.
- Olmsted, Vaux & Co.
- Olmsted, Vaux and company, New York.
- Olney, John E
- Olney, Raymond, 1885-
- Olney, Stephen T. (Stephen Thayer), 1812-1878
- Olocco Diz, María J.
- Olofsson, Ossian Herman, 1886-
- Oloriz, F
- Olorode, O
- Olou, Boris
- O'Loughlin, Jennifer.
- O'Loughlin, Luke
- O'loughlin, P Mark
- O'Loughlin, P. Mark
- Olowokudejo, James Dele.
- Olphe-Galliard, Léon, 1825-1893
- Olphe-Galliard, Léon.
- Olsen, A M
- Olsen, A R
- Olsen, Alfred James.
- Olsen, Arnold.
- Olsen, Ben.
- Olsen, Bill.
- Olsen, C E
- Olsen, Chris E
- Olsen, Chris E.
- Olsen, D A
- Olsen, David.
- Olsen, Diane
- Olsen, Edward John, 1927-
- Olsen, G. H.
- Olsen, George, 1874-1939
- Olsen, J
- Olsen, J L
- Olsen, Jerry
- Olsen, Jim.
- Olsen, John
- Olsen, Kenneth L.
- Olsen, Kjell Magne
- Olsen, Klaus Malling
- Olsen, L. P. (Lucille P.)
- Olsen, Leandro Borges
- Olsen, N
- Olsen, Neil A.
- Olsen, O W
- Olsen, O Wilford
- Olsen, Ole Theodor
- Olsen, Ørjan
- Olsen, Orvil A.
- Olsen, P
- Olsen, Paul E.
- Olsen, Paul Eric.
- Olsen, R. Earl
- Olsen, Richard
- Olsen, Richard T
- Olsen, S
- Olsen, Sandra L.
- Olsen, Stanley John, 1919-
- Olsen, W. K.
- Olʹshanskiĭ, M. A.
- Olson, A R
- Olson, A. Richard.
- Olson, Angeleen
- Olson, C A
- Olson, C V
- Olson, Carl
- Olson, Chad
- Olson, Charles E.
- Olson, Craig M. (Craig MacKay), 1949-
- Olson, D
- Olson, D R
- Olson, Dan
- Olson, David F.
- Olson, David P.
- Olson, Dede
- Olson, Douglas, 1949-
- Olson, E C
- Olson, Eric J
- Olson, Everett C
- Olson, Everett Claire, 1910-1993
- Olson, Franklin James.
- Olson, Harry Ferdinand, 1901-
- Olson, Henry W. (Henry William), 1902-
- Olson, J Bennet
- Olson, J E
- Olson, Jeannette R.
- Olson, Jerry E.
- Olson, John F.
- Olson, Julius Emil, 1858-
- Olson, Magnus
- Olson, Mark E.
- Olson, Mary E
- Olson, Michael M.
- Olson, N F
- Olson, R E
- Olson, Randy W.
- Olson, Richard Randolph
- Olson, Russell O. (Russell Oscar), 1917-
- Olson, Sigurd F
- Olson, Storrs L.
- Olson, T Rowland
- Olson, Tamara L.
- Olson, W A
- Olson, Wendy C.
- Olson, William
- Olson, Zach H.
- Olson-Edge, S L
- Olson-Edge, Sally L.
- Olson-Elliott and Associates.
- Olson-Rutz, Kathrin M
- Olson-Zúnica, Mark E.
- Olssen-Seffer, Pehr
- Olsson, Axel A. (Axel Adolf), 1889-1976
- Olsson, Daniel
- Olsson, Jens
- Olsson, Karin H.
- Olsson, Peter
- Olsson, Richard K.
- Olsson, Urban.
- Olsson-Seffer, Pehr Hjalmar, 1873-1911
- Olszewska, Sandra
- Olszewski, Piotr
- Olszewski, Tomasz S
- Olterman, James Howard.
- Oltmanns, Friedrich, 1860-1945
- Oltman-Shay, Joan.
- Olton, G S
- Oltra, Christian
- Oltra, M T
- Olu, Karine
- Olufolaji, D B
- Olver, J B S
- Olvera, O
- Olvera-Novoa, Miguel A
- Olvera-Ramírez, Roxana
- Olvera-Velona, Angeluz
- Olwell, Margaret
- Olwell, P
- Olwell, Peggy
- Olynyk, J.
- Om, Prakash Dubey
- Omacrtsu, Takashi
- Omad, Guillermo
- Omad, Guillermo H.
- Omaha Polled Shorthorn Sale Omaha, Nebraska) 1957-
- Omaha Shorthorn Sale Omaha, Nebraska) 1955-
- O'Mahony, Dermot
- Omaliss, Keo
- O'Malley, Henry,
- O'Malley, Henry, 1876-1936
- O'Malley, J. Brian E.
- O'Malley, Karen J
- Oman, Heather D.
- Oman, P W
- Oman, P. W.
- Oman, Paul
- Oman, Paul W. (Paul Wilson), 1908-
- Oman, Paul Wilson, 1908-