| Oriental royal councils | 23 |
| Oriental skirt feature | 22 |
| Oriental soup ingredient | 24 |
| Oriental unit of weight | 23 |
| Oriental units of weight | 24 |
| Orientalist from Lowell | 23 |
| Orienteer's reference | 25 |
| Origami creature, sometimes | 27 |
| Origami hobbyist, e.g. | 22 |
| Origami output, sometimes | 25 |
| Origin of "stoical" | 29 |
| Origin of a 1965 march | 22 |
| Origin of a certain condiment | 29 |
| Origin of a fictional falcon | 28 |
| Origin of a large terrier | 25 |
| Origin of a stream: Abbr. | 25 |
| Origin of some 1930s migrants | 29 |
| Origin of the Euphrates | 23 |
| Original "Playboy" | 28 |
| Original amendments count | 25 |
| Original Beatle Sutcliffe | 25 |
| Original Crayola pack, e.g. | 27 |
| Original D&D company | 24 |
| Original D&D publisher | 26 |
| Original Enterprise navigator | 29 |
| Original form of a word | 23 |
| Original forms of words | 23 |
| Original Hambletonian site | 26 |
| Original introduction? | 22 |
| Original Krupp Works city | 25 |
| Original Luddite ___ Ludd | 25 |
| Original Miss America? | 22 |
| Original MTV veejay Blackwood | 29 |
| Original MTV VJ Blackwood | 25 |
| Original MTV VJ Hunter | 22 |
| Original N.Y.C. subway line | 27 |
| Original N.Y.C. subway system | 29 |
| Original name of Pius XI | 24 |
| Original name of Volgograd | 26 |
| Original name preceder | 22 |
| Original nudist colony | 22 |
| Original number for a nation | 28 |
| Original NYC subway operator | 28 |
| Original Obi-Wan portrayer | 26 |
| Original Olympics site | 22 |
| Original Oreo competitor | 24 |
| Original portrayer of Obi-Wan | 29 |
| Original Roanoke settlement? | 28 |
| Original Robinson Crusoe | 24 |
| Original Shakespeare edition | 28 |
| Original site of U. of Nevada | 29 |
| Original source of calico | 25 |
| Original Speed Stick maker | 26 |
| Original subway line in NYC | 27 |
| Original Thanksgiving fare | 26 |
| Original U.S. space station | 27 |
| Original Woodstock rocker | 25 |
| Original, at Oktoberfest | 24 |
| Originally, a choral song | 25 |
| Originally, a male servant | 26 |
| Originate, as a phrase | 22 |
| Originate, so to speak | 22 |
| Originating from within | 23 |
| Originating in the intellect | 28 |
| Originating in the sea | 22 |
| Originating within a company | 28 |
| Originator of cutout dresses | 28 |
| Originator of euphuism | 22 |
| Originator of Jellicle Cats | 27 |
| Originators of putt-putts | 25 |
| Origins Game Fair, e.g. | 23 |
| Origins of earthquakes | 22 |
| Orinoco Flow singer | 22 |
| Orinoco y Guadalquivir | 22 |
| Oriole or Blue Jay, e.g. | 24 |
| Oriole or Blue Jay, for short | 29 |
| Oriole or Tiger, for short | 26 |
| Oriole or Tiger, informally | 27 |
| Oriole or Yankee, briefly | 25 |
| Oriole or Yankee, informally | 28 |
| Oriole or Yankee, slangily | 26 |
| Oriole Park at __ Yards | 23 |
| Oriole Park at ___ Yards | 24 |
| Oriole's distant relative | 29 |
| Oriole's home, perhaps | 26 |
| Orioles catcher Hernández | 28 |
| Orioles manager Mazzilli | 24 |
| Orioles team physician? | 23 |
| Orioles third baseman Melvin | 28 |
| Orioles, Eagles or Cardinals | 28 |
| Orion made love to her | 22 |
| Orion Mars mission gp. | 22 |
| Orion's bright spot | 23 |
| Orion's brightest star | 26 |
| Orion's hunting companion | 29 |
| Orion, with "the" | 27 |
| Orkin agent's quarry | 24 |
| Orkney Islands ancient | 22 |
| Orkney Islands settler | 22 |
| Orkney land-tenure system | 25 |