Roll of honor : Citizens of the State of New York who died while in the service of the United States during the World war.
- O'Brien, Albert J
- O'Brien, Charles F.
- O'Brien, Daniel F.
- O'Brien, David
- O'Brien, Dennis J.
- O'Brien, Edward J
- O'Brien, Francis
- O'Brien, Frank
- O'Brien, George A
- O'Brien, Herbert J
- O'Brien, Hugh J
- O'Brien, James Francis
- O'Brien, James Joseph
- O'Brien, Jeremiah
- O'Brien, John B.
- O'Brien, John C
- O'Brien, John F
- O'Brien, John J
- O'Brien, John J.
- O'Brien, John L
- O'Brien, John T
- O'Brien, Joseph E
- O'Brien, Michael
- O'Brien, Michael James
- O'Brien, Michael W.
- O'Brien, Thomas A
- O'Brien, Thomas F
- O'Brien, Thomas J
- O'Brien, Timothy J
- O'Brien, William
- O'Brien, William James
- O'Briest, Charles
- O'Byrne, Patrick J.
- O'Connell, Artaur J
- O'Connell, Charles
- O'Connell, Charles J
- O'Connell, Daniel
- O'Connell, Daniel
- O'Connell, Daniel A
- O'Connell, Daniel M
- O'Connell, Frank
- O'Connell, George F
- O'Connell, John V
- O'Connell, Michael
- O'Connell, Michael J
- O'Connell, Peter
- O'Connell, Thomas
- O'Connell, Thomas J
- O'Connell, Walter Dennis
- O'Connell, William D.
- O'Connell, William J
- O'Connor, Arthur P
- O'Connor, Charles Arthur
- O'Connor, Daniel J
- O'Connor, Daniel P
- O'Connor, David
- O'Connor, Edwin Francis
- O'Connor, Francis J
- O'Connor, Frank A
- O'Connor, James A.
- O'Connor, James J Jr
- O'Connor, James P
- O'Connor, James P
- O'Connor, James Thomas
- O'Connor, John J
- O'Connor, John J
- O'Connor, John J
- O'Connor, John T
- O'Connor, Joseph F.
- O'Connor, Michael B.
- O'Connor, Phillip J.
- O'Connor, Thomas J
- O'Connor, Thomas J.
- O'Connor, William F
- O'Connor, William H.
- O'Day, Charles W.
- O'Dea, John F.
- O'Dea, Raymond F
- O'Dell, John J.
- O'Donald, Charles W
- O'Donnell, Charles
- O'Donnell, Hugh
- O'Donnell, James C
- O'Donnell, James V.
- O'Donnell, John G.
- O'Donnell, Michael S.
- O'Donnell, Thomas F.
- O'Donnell, Thomas F.
- O'Donoghue, Michael T
- O'Donovan, Thomas P.
- O'Dowd, Dennis H
- O'Dowd, John
- O'Flaherty, James E.
- O'Gorman, Thomas
- O'Grady, John J.
- O'Grady, John Joseph
- O'Hallaran, James F.
- O'Hara, Frank J.
- O'Hara, John
- O'Hara, John J.
- O'Hara, Thomas
- O'Hare, Daniel
- O'Hare, Daniel J
- O'Hare, James A.
- O'Hern, Joseph F.
- O'Keefe, Joseph A.
- O'Keefe, Thomas C.
- O'Laughlin, Frank
- O'Leary, Arthur
- O'Leary, Bartholomew
- O'Leary, John J.
- O'Leary, Richard
- O'Leary, Timothy
- O'Malley, Peter
- O'Mara, Valentine
- O'Marra, Thomas J.
- O'Meara, David M.
- O'Meara, Francis
- O'Meara, John W.
- O'Meara, William J
- O'Neale, James S., Jr.
- O'Neil, Alfred H.
- O'Neil, John T.
- O'Neil, Thomas
- O'Neill, Arthur
- O'Neill, Chester H
- O'Neill, Daniel J.
- O'Neill, George J.
- O'Neill, Henry J.
- O'Neill, Herbert J.
- O'Neill, John
- O'Neill, John P.
- O'Neill, Lewis E. G.
- O'Neill, Michael J.
- O'Neill, Michael J.
- O'Neill, Nicholas F.
- O'Neill, Patrick J
- O'Neill, Patrick J.
- O'Neill, William
- O'Reilly, Bernard D.
- O'Reilly, Edward
- O'Reilly, Joseph V.
- O'Reilly, William J.
- O'Rorke, Joseph
- O'Rorke, Patrick C.
- O'Rourke, James M.
- O'Rourke, James P.
- O'Rourke, John
- O'Rourke, John J.
- O'Rourke, Joseph
- O'Rourke, Michael F.
- O'Rourke, Thomas F.
- O'Rourke, Thomas F.
- O'Shea, Edward J.
- O'Shea, Thomas
- O'Sullivan, Frank
- O'Sullivan, Michael D
- O'Sullivan, Michael R.
- O'Toole, Arthur
- Oak, Harry Arthur
- Oakley, John R.
- Obuhski, Walter
- Ocaler, Max S.
- Ochlmann, Arthur H.M.
- Ochs, Albert Stanley
- Odello, Frank
- Oderkirk, Claude J.
- Oelkers, Arend G.
- Oeser, Henry H. Jr.
- Offenburger, William
- Ohlhausen, George N.
- Ohlson, Alfred H.
- Ohren, George E
- Okunski, John
- Olansen, Jay H.
- Olds, George
- Oleshuk, Selvester
- Olhausen, Jay H.
- Olian, Isidor
- Oligny, Joseph A
- Oliquist, Edward H.
- Oliva, Joseph
- Oliva, Joseph W
- Oliver, Clarence R
- Oliver, Otis
- Olmstead, Carl P
- Olmsted, Arthru F.
- Olsen, Arthur W.
- Olsen, Charles
- Olsen, Edwin
- Olsen, Gustave E.
- Olsen, Harry A.
- Olsen, Herbert Ernest
- Olsen, John
- Olsen, Olov A.
- Olsen, Oluf A.
- Olsen, Orman G.
- Olsen, Robert
- Olsen, Wm Leslie
- Olson, Carl M
- Olson, Ole B
- Olstein, Matthew
- Oltman, Henry
- Omundsen, Abraham L
- Onczar, Stanley
- Onken, August Joseph
- Onorio, Creno
- Oppel, William
- Optofsky, Moses
- Orbaker, Kenneth K.
- Orbinatti, Antonio
- Orchard, William H.
- Orlando, Salvatore
- Orlowski, John R.
- Ormond, William J.
- Orne, Edward Earle
- Ornsby, Orsen C
- Ornstein, Albert J
- Oroho, James J.
- Orozietti, Frederico
- Orr, Clarence J.
- Orsbourn, Ernest W
- Orser, Thomas H
- Ortlieb, Frank J.
- Ortlieb, Theodore
- Orton, Everett E.
- Osborn, Emory R
- Osborn, Leonard
- Osborn, Stanley Meyer
- Osborn, William H.
- Osborne, Albert W.
- Osborne, Alfred James
- Osborne, Lawrence M.
- Osborne, Thomas
- Osgood, Harold S.
- Osmers, Phillip J.
- Osofsky, Harry
- Ossont, Charles R.
- Osswalt, John H.
- Ostberg, Charles G.
- Ostby, Joseph P.A.
- Oster, Lester W
- Osterberg, John D.
- Osterhaus, Harold
- Osterhoudt, Clarence
- Ostrander, Cliffors W
- Ostrerhoudt, Harrison G
- Ostrom, Einar
- Ostrowski, Francis S
- Ostroy, Paul
- Oswald, Julius
- Otero, Juan
- Otis, Roy AQ
- Ott, Ferdinand W.
- Ott, John F
- Ott, John M.
- Ottati, Anello F
- Otto, Frank
- Otto, John Christian
- Ouderkirk, Nelson R.
- Overstreet, Coy
- Overton, William C.
- Ovesen, Martin Marinus
- Ovington, Carter I.
- Owen, Guy
- Owen, John G
- Owens, Edward L.
- Owens, Frank
- Owens, Frank Robert
- Owens, Joseph
- Owens, Levi
- Owens, Patrick
- Owens, Walter F
- Owings, Samuel D.
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