Aa - Alg, All - And, Ang - Ay |Baa - Bak, Bal - Baro, Barr - Beam, Bean - Benj, Benn - Blib, Bill - Bliv, Blo - Bov, Bow - Brant, Bras - Brou, Brow - Brown, Bru - Burnh, Burns - Byr |Cab - Caro, Carp - Cas, Cat - Chils, Chit - Clark, Clas - Cold, Cole - Conl, Conn - Coot, Cope - Cow, Cox - Cross, Crote - Cy |Dab - Dav, Daw - Dens, Dent - Dix, Doa - Dow, Dox - Dy |Ea - Ell , Elm - Ey |Faa - Fero, Ferr - Flet, Fling - Fral, Fran - Fyn |Ga - Gat, Gau - Glass, Glasse - Gow, Gra - Gree, Greg - Gy |Haa - Hal, Ham - Harro, Harry - Haw, Hay - Hene, Heni - Hicks, Hie - Hock, Hod - Hopt, Hor - Hopk, Hopp - Huf, Hug - Hy |I |Ja - Johnso, Johnst - Ju |Ka - Kenda, Kendr - Kipp, Kir - Ky |La - Las, Lat - Leok, Leon - Lock, Lodes - Ly |Mab - Marr, Mars - Maz, McA - McE, McF - McL, McM - Mem, Men - Milla, Mille - Moon, Moor - Mosm Moss - Murl, Murn - My |Na - Ney, Ni - Ny |Oa - Om, On - Oz |Pa - Pat, Pau - Peu, Pf - Poor, Pop - Py |Q |Ra - Rav, Reg - Ril, Rim - Roll, Rom - Ry |Sa - Schm, Schn - Sel, Sem - Sherl, Sherm - Silli, Sils - Slay, Sle - Smi, Smo - Stag, Stah - Stek, Steu - Stok, Stol - Stud, Stum - Sy |Ta - Thi, Tho - Top, Tor - Ty |U |V |Wa - Walt, Walw - Way, We - Wer, Wes - White, Whitf - Wilg, Wilh - Wilm, Wils - Wom, Woo - Wy |Y |Z
| Last | First | Middle | Rank | CO | Regiment | Fld | Service | State | County | Town | Cemetery | State Buried |
| Onderdonk | Andrew | S | 2d Lt. | I | 90 | th | Vol. Infantry | NY | Orleans | Albion | Mt. Albion | NY |
| O'Neal | James | Private | C | 4 | th | H. Artillery | NY | Ontario | W. Bloomfield | W. Bloomfield | NY | |
| O'Neal | Daniel | A | Private | A | 33 | rd | Vol. Infantry | NY | Ontario | Geneva | Catholic | NY |
| O'Neal | Charles | Private | 85 | th | Vol. Infantry | NY | Monroe | Rochester | Holy Sepulcher | NY | ||
| O'Neil | John | Private | E | 184 | th | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY | |
| O'Neil | John | Private | E | 3 | rd | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY | |
| O'Neil | Daniel | Private | D | 45 | th | Vol. Infantry | Penn | Erie | Buffalo | Forest Lawn | NY | |
| O'Neil | Dennis | Private | A | 168 | th | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY | |
| O'Neil | Edward | Private | B | 164 | th | Vol. Infantry | NY | Sumpter | Andersonville | National | Ga. | |
| O'Neil | James | Private | H | 3 | rd | Vol. Infantry | Mich. | Adams | Gettysburg | National | Penn. | |
| O'Neil | James | 2d Lt. | E | 25 | th | Vol. Infantry | Mass. | Steuben | Bath | V Hospital | NY | |
| O'Neil | Michael | Corp. | D | 6 | th | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY | |
| O'Neil | William | Private | K | 155 | th | Vol. Infantry | NY | Erie | Lackawana | Holy Cross | NY | |
| O'Neil | James | Private | 18 | th | Reg. Infantry | US | Niagara | Niagara | Oakwood | NY | ||
| O'Neil | Arthur | Private | D | 14 | th | Vol. Infantry | NY | Wyoming | Cowlesville | Cowlesville | NY | |
| O'Neil | John | Private | K | 5 | th | Vet Infantry | NY | Yates | Penn Yann | St. Michaels | NY | |
| O'neil | William | Private | 140 | th | Vol. Infantry | NY | Monroe | Rochester | Mt. Hope | NY | ||
| O'Neil | John | Private | G | 169 | th | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY | |
| O'Neill | John | H | Private | C | 33 | rd | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY |
| O'Neill | Christopher | Private | 1 | st | Lt. Artillery | NY | Steuben | Bath | V Hospital | NY | ||
| O'Niel | William | Private | I | 5 | th | Vet Infantry | NY | Yates | Penn Yann | St. Michaels | NY | |
| Opitz | Gustave | Private | H | 116 | th | Vol. Infantry | NY | Erie | Buffalo | Forest Lawn | NY | |
| Orcutt | Henry | Private | C | 7 | th | Cavalry | NY | Monroe | Rochester | Holy Sepulcher | NY | |
| Ordway | Charles | E | Private | K | 86 | th | Vol. Infantry | NY | Steuben | Canisteo | Woodlawn | NY |
| Ordway | Charles | W | Private | 86 | th | Vol. Infantry | NY | Steuben | Jasper | Hampshire | NY | |
| Oreen | Michael | Private | E | 4 | th | H. Artillery | NY | Steuben | Bath | V Hospital | NY | |
| O'Reiley | Patrick | Private | K | 164 | th | Vol. Infantry | NY | Sumpter | Andersonville | National | Ga. | |
| O'Reiley | Patrick | Private | 59 | th | Vol. Infantry | NY | Monroe | Honeoye Falls | St. Pauls | NY | ||
| O'Reilly | Denis | T | Private | 164 | th | Vol. Infantry | NY | Erie | Cheektowaga | German/French #2 | NY | |
| Oren | Charles | Private | G | 26 | th | Vol. Infantry | NY | Monroe | Rochester | Mt. Hope | NY | |
| Orkins | Henry | J | Sergeant | D | 1 | st | Vet. Cavalry | NY | Steuben | Bath | V Hospital | NY |
| Orman | James | O | Private | L | 126 | th | Vol. Infantry | NY | Ontario | Geneva | Glenwood | NY |
| Orman | John | R | Private | E | 126 | th | Vol. Infantry | NY | Ontario | Geneva | Glenwood | NY |
| Ormsby | Cyranus | P | Private | G | 64 | th | Vol. Infantry | NY | Allegany | Alfred | Rural | NY |
| Ormsby | Daniel | Private | B | 179 | th | Vol. Infantry | NY | Allegany | Alfred | Rural | NY | |
| Ormsby | Rowland | L | Private | G | 64 | th | Vol. Infantry | NY | Allegany | Alfred | Rural | NY |
| Ormsby | Robert | L | Private | B | 179 | th | Vol. Infantry | NY | Steuben | Canisteo | Woodlawn | NY |
| Ormsby | Roland | L | Private | G | 64 | th | Vol. Infantry | NY | Adams | Gettysburg | National | Penn. |
| Ornbeck | Hamilton | Private | C | 97 | th | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY | |
| Ornsby | Joseph | Private | G | 131 | st | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY | |
| O'Rorke | John | Private | I | 19 | th | Vol. Infantry | Ohio | Steuben | Bath | V Hospital | NY | |
| O'Rorke | Patrick | H | Colonel | Staff | 140 | th | Vol. Infantry | NY | Monroe | Rochester | Holy Sepulcher | NY |
| O'Rourke | John | Private | C | 97 | th | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY | |
| Orr | George | W | Fifer | H | 44 | th | Vol. Infantry | NY | Erie | Sardinia | Sardinia | NY |
| Orr | Daniel | W | Private | H | 8 | th | Infantry | NY | Genesee | North Pembroke | N. Pembroke | NY |
| Orr | James | Private | G | 28 | th | Vol. Infantry | NY | Niagara | Lockport | Cold Springs | NY | |
| Orr | Charles | Alvin | Private | G | 187 | th | Vol. Infantry | NY | Erie | Buffalo | Forest Lawn | NY |
| Orr | Robert | Sergeant | 44 | th | Vol. Infantry | NY | Erie | Buffalo | Forest Lawn | NY | ||
| Orr | George | F | Private | I | 9 | th | Cavalry | NY | Cattaraugus | East Otto | East Otto | NY |
| Orr | John | W | Private | C | 64 | th | Vol. Infantry | NY | Cattaraugus | East Otto | Brooklyn | NY |
| Orr | James | Private | 161 | st | Vol. Infantry | NY | Steuben | Wallace | Wallace | NY | ||
| Orr | Robert | Private | H | 107 | th | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY | |
| Orsland | Harry | B | Private | G | 151 | st | Vol. Infantry | NY | Orleans | Kendall | Greenwood | NY |
| Ort | Peter | S | Private | H | 21 | st | Cavalry | NY | Livingston | Scottsburg | Union | NY |
| Orth | Felix | Private | I | 100 | th | Vol. Infantry | NY | Hampton Town | Hampton | National | Va. | |
| Orton | Abram | Corp. | G | 97 | th | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY | |
| Orton | Albert | S | Private | I | 1 | st | Lt. Artillery | Ill. | Wyoming | Java | Baptist Ch. | NY |
| Orton | Joseph | G | Private | I | 12 | th | Cavalry | Mo. | Erie | Collins | Holy Sprit | NY |
| Orvis | James | C | Private | K | 86 | th | Vol. Infantry | NY | Steuben | Canisteo | Woodlawn | NY |
| Orwan | Charles | F | Sergeant | C | 141 | st | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY |
| Osborn | Wilbur | F | Private | D | 2 | nd | Cavalry | NJ | Steuben | Bath | V Hospital | NY |
| Osborn | Gilbert | H | Private | I | 75 | th | Vol. Infantry | NY | Shiawassee | Owosso | Oak Hill | Mich. |
| Osborn | Edwin | W | Private | M | 11 | th | Cavalry | NY | Erie | South Wales | Warner Rd | NY |
| Osborn | Edmund | Private | F | 100 | th | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY | |
| Osborn | George | L | Private | 111 | th | Vol. Infantry | NY | Chautauqua | Busti | Busti | NY | |
| Osborne | Benjamin | F.L. | Sergeant | H | 3 | rd | Lt. Artillery | NY | Steuben | Bath | V Hospital | NY |
| Osborne | Samuel | Musician | E | 122 | nd | Vol. Infantry | NY | Steuben | Bath | V Hospital | NY | |
| Osborne | B | Franklin | Private | D | 64 | th | Vol. Infantry | NY | Allegany | Cuba | Cuba | NY |
| Osborne | Elijah | P | Private | K | 24 | th | Vol. Infantry | Mich. | Erie | Akron | Akron | NY |
| Osburn | Fred | S | Private | H | 40 | th | Vol. Infantry | NY | Monroe | Rochester | Mt. Hope | NY |
| Osgood | Stephen | Private | C | 154 | th | Vol. Infantry | NY | Cattaraugus | Ischua | Ischua | NY | |
| Osgood | Chase | Private | H | 39 | th | Vol. Infantry | Penn | Cattaraugus | Randolph | Cemetery Rd. | NY | |
| Osgood | Vriling | Daniel | Musician | H | 136 | th | Vol. Infantry | NY | Wyoming | Cowlesville | Cowlesville | NY |
| Osgood | William | W | Private | C | 154 | th | Vol. Infantry | NY | Cattaraugus | Ischua | Ischua | NY |
| Osgood | N | Weston | Private | G | 98 | th | Vol. Infantry | NY | Niagara | Lockport | Cold Springs | NY |
| Osgood | John | Private | 136 | th | Vol. Infantry | NY | Cattaraugus | Olean | Pleasant Valley | NY | ||
| O'Shaunessy | Martin | Private | B | 13 | th | H. Artillery | NY | Steuben | Bath | V Hospital | NY | |
| Osier | David | Private | E | 9 | th | H. Artillery | NY | Steuben | Bath | V Hospital | NY | |
| Osier | Lewis | Private | A | 14 | th | H. Artillery | NY | Steuben | Bath | V Hospital | NY | |
| Oster | Nicholas | Private | K | 12 | th | Cavalry | NY | Genesee | Corfu | Evergreen Hill | NY | |
| Oster | Charles | Private | I | 108 | th | Vol. Infantry | NY | Monroe | Rochester | Holy Sepulcher | NY | |
| Osterhout | Justin | H | Private | E | 16 | th | H. Artillery | NY | Steuben | Bath | V Hospital | NY |
| Osterhout | Charles | Private | B | 8 | th | Vol. Infantry | Minn. | Allegany | Belmont | Episcopal | NY | |
| Osterhout | Charles | Wife | B | 8 | th | Vol. Infantry | Minn. | Monroe | Rochester | Mt. Hope | NY | |
| Osterhout | Charles | Private | B | 8 | th | Vol. Infantry | Minn. | Allegany | Amity | Christ Church | NY | |
| Osterman | John | Private | C | 16 | th | Cavalry | NY | Cattaraugus | Allegany | St. Bonaventure | NY | |
| Osterstuck | Emery | Private | C | 154 | th | Vol. Infantry | NY | Cattaraugus | Hinsdale | Smith Crns | NY | |
| Osterstuck | William | Private | I | 154 | th | Vol. Infantry | NY | Sumpter | Andersonville | National | Ga. | |
| Ostheim | William | Private | 33 | rd | Lt. Artillery | NY | Erie | Buffalo | Forest Lawn | NY | ||
| Ostram | Henry | J. | Private | M | 20 | th | Cavalry | NY | Steuben | Bath | V Hospital | NY |
| Ostran | William | R | Private | 1 | st | Sharpshooters | NY | Monroe | Hamlin | Lakeview | NY | |
| Ostrandeer | Geroge | E | Private | B | 14 | th | H. Artillery | NY | Orleans | Murray | SandyCreek | NY |