A Harlequin Romance Series Year – 1951
| # | Author | Book Title | Year |
| # 91 | Carl Shannon | Lady, That’s My Skull | 1951 |
| # 92 | Doug Cameron | Dig Another Grave | 1951 |
| # 93 | Al Cody | Empty Saddles | 1951 |
| # 94 | Oscar J. Friend | The Range Doctor | 1951 |
| # 95 | James Hadley Chase | You’re Lonely When You’re Dead | 1951 |
| # 96 | Norman Fox A. | The Rider from Yonder | 1951 |
| # 97 | Ferguson Findley | My Old Man’s Badge | 1951 |
| # 98 | John Roeburt | Jigger Moran | 1951 |
| # 99 | Bill Miller, Bob Wade | Murder-Queen High | 1951 |
| # 100 | Jackson Cole | Black Rider | 1951 |
| # 101 | Joe Barry | Three for the Money | 1951 |
| # 102 | Brian Moore | Wreath for a Redhead | 1951 |
| # 103 | O.M. Hall | Wanton City | 1951 |
| # 104 | John Roeburt | Tough Cop | 1951 |
| # 105 | Paul Evan Lehman | Vengeance Valley | 1951 |
| # 106 | Robert Leslie Bellem | The Window With the Sleeping Nude | 1951 |
| # 107 | Clarence E. Mulford / Clarence Edward Mulford | The Man from Bar-20 | 1951|
| # 108 | James Hadley Chase | No Orchids for Miss Blandish | 1951 |
| # 109 | John Roeburt | Corpse on the Town | 1951 |
| # 110 | William Hopson | Tombstone Stage | 1951 |
| # 111 | James Hadley Chase | The Flesh of the Orchid | 1951 |
| # 112 | George Albert Glay | Gina | 1951 |
| # 113 | Jean Plaidy | Beyond the Blue Mountains | 1951 |
| # 114 | William Bogart | Johnny Saxon | 1951 |
| # 115 | John Roeburt | Manhattan Underworld | 1951 |
| # 116 | John Creasey | Kill the Toff | 1951 |
| # 117 | Brian Moore | The Executioners | 1951 |
| # 118 | Paul Evan Lehman | Range Justice | 1951 |
| # 119 | J.E. Grinstead | When Texans Ride | 1951 |
| # 120 | Harry Whittington | Slay Ride for a Lady | 1951 |
| # 121 | Michael Stark | Run for Your Life | 1951 |
| # 122 | Sam Merwin Jr. | A Matter of Policy | 1951 |
| # 123 | Allan K. Echols | Saddle Wolves | 1951 |
| # 124 | James Hadley Chase | The Dead Stay Dumb | 1951 |
| # 125 | Gamett Weston | The Hidden Portal | 1951 |
| # 126 | Frank Kane | Death About Face | 1951 |
| # 127 | Edward Ronns | Dark Memory | 1950 |
| # 128 | Paul Evan Lehman | Law of the ’45 | 1951 |
| # 129 | Ferguson Findley | Hire This Killer | 1951 |
| # 130 | James Hadley Chase | Figure It Our For Yourself | 1951 |
| # 131 | Clarence E. Mulford / Clarence Edward Mulford | Tex | 1951 |
| # 132 | Leslie Edgley | False Face | 1951 |
| # 133 | Bradford Street | Frontier Doctor | 1951 |
| # 134 | George C. Henderson | The Killers | 1951 |
| # 135 | James Hadley Chase | Lay Her Among the Lilies | 1951 |
| # 136 | Weston Clay | Boot Hill | 1951 |
| # 137 | Robert Joseph | Berlin at Midnight | 1951 |
| # 138 | Lozania Prole | Emma Hart | 1951 |
| # 139 | Paul W. Fairman | The Glass Ladder | 1951 |
| # 140 | Harry Whittington | The Lady Was a Tramp | 1951 |
| # 141 | Thomas H. Raddall | Roger Sudden | 1951 |
| # 142 | Thomas Stone | Doctor by Day | 1951 |
| # 143 | Leslie Ernenwein | Rebel Yell | 1951 |
| # 145 | Leslie Ernenwein | Rio Renegade | 1951 |
| # 146 | Lynn Westland | Trail Rider | 1951 |
| # 147 | Dale Bogard | Pardon My Body | 1951 |

