| Opie, at the lake, sometimes | 28 |
| Opie's answer to Aunt Bee | 29 |
| Opie Taylor's caretaker | 27 |
| Ophthalmologist's tool | 26 |
| Ophthalmologist's supply | 28 |
| Ophthalmologist's study | 27 |
| Ophthalmologist's order | 27 |
| Ophthalmologist's office? | 29 |
| Ophthalmologist's concern | 29 |
| Ophthalmologist's cases | 27 |
| Ophthalmologist's case | 26 |
| Ophthalmological study | 22 |
| Ophthalmological concern | 24 |
| Ophthalmologic problem | 22 |
| Ophthalmologic concern | 22 |
| Ophthalmic development | 22 |
| Ophthalmic concern (Var.) | 25 |
| Ophiologist's study | 23 |
| Ophelia's thought flower | 28 |
| Ophelia or Laertes, e.g. | 24 |
| Ophelia or Claudius, e.g. | 25 |
| Ophelia and Hamlet, e.g. | 24 |
| Operetta set in Titipu | 22 |
| Operetta princess and others | 28 |
| Operetta composer Franz | 23 |
| Operators standing by? | 22 |
| Operator's request? | 23 |
| Operator's request | 22 |
| Operator's post, once | 25 |
| Operator's number? | 22 |
| Operator's concern: Abbr. | 29 |
| Operator's accessory | 24 |
| Operator of MouthHealthy.org | 28 |
| Operator of a metal plant | 25 |
| Operative's employer | 24 |
| Operational headquarters | 24 |
| Operation-launching times | 25 |
| Operation ___ Freedom (2003) | 28 |
| Operation Trinity locale | 24 |
| Operation Trinity event | 23 |
| Operation Solomon airline | 25 |
| Operation since August 1990 | 27 |
| Operation Redwing event, 1956 | 29 |
| Operation Red Dawn city | 23 |
| Operation Pipe Dreams org. | 26 |
| Operation Phone Home gp. | 24 |
| Operation Overlord, e.g. | 24 |
| Operation Overlord's time | 29 |
| Operation Overlord time | 23 |
| Operation Overlord site | 23 |
| Operation Overlord overseer | 27 |
| Operation Overlord monogram | 27 |
| Operation Overlord launch | 25 |
| Operation Overlord high point | 29 |
| Operation Overlord beach | 24 |
| Operation Neptune Spear org. | 28 |
| Operation Mail Call grp. | 24 |
| Operation Mail Call gp. | 23 |
| Operation Just Cause target | 27 |
| Operation in 1998 news | 22 |
| Operation IceBridge grp. | 24 |
| Operation Hastings org. | 23 |
| Operation Exodus participant | 28 |
| Operation Enduring Care gp. | 27 |
| Operation Desert Storm target | 29 |
| Operation Desert Storm | 22 |
| Operation Desert Fox, e.g. | 26 |
| Operation Cyclone org. | 22 |
| Operation by an obstetrician | 28 |
| Operation at the Alamo | 22 |
| Operation Allied Force gp. | 26 |
| Operating-room process | 22 |
| Operating without _____ | 23 |
| Operating with efficiency | 25 |
| Operating system, abbr. | 23 |
| Operating system since 1969 | 27 |
| Operating system option | 23 |
| Operating system for PCs | 24 |
| Operating system choice | 23 |
| Operating simultaneously | 24 |
| Operating room request | 22 |
| Operating room number? | 22 |
| Operating room necessities | 26 |
| Operating room devices | 22 |
| Operating room assistant | 24 |
| Operating room apparel | 22 |
| Operating procedures: Abbr. | 27 |
| Operating procedures (abbr.) | 28 |
| Operating automatically | 23 |
| Operating at peak capacity | 26 |
| Operatic villains, often | 24 |
| Operatic Trojan princess | 24 |
| Operatic tour de force | 22 |
| Operatic tenor ___ Alagna | 25 |
| Operatic tenor Vickers | 22 |
| Operatic soprano Netrebko | 25 |
| Operatic soprano Marilyn | 24 |
| Operatic soprano Gluck | 22 |
| Operatic soprano Geraldine | 26 |
| Operatic soprano from N.Y.C. | 28 |