| Oct. preceder | 13 |
| Oct. precursor | 14 |
| Oct. predecessor | 16 |
| Oct. start of a new Supreme Court session | 41 |
| Oct. stone | 10 |
| Oct.'s birthstone | 21 |
| Oct.'s gem | 14 |
| Oct.'s stone | 16 |
| Oct., Nov., etc. | 16 |
| Octa preceder | 13 |
| Octa- + two | 11 |
| Octa- divided by two | 20 |
| Octa- halved | 12 |
| Octa- minus one | 15 |
| Octa- plus one | 14 |
| Octa- plus two | 14 |
| Octad | 5 |
| Octad in a gallon | 17 |
| Octad plus one | 14 |
| Octagon features | 16 |
| Octagon inscription | 19 |
| Octagon or oval | 15 |
| Octagon or oval e.g. | 21 |
| Octagon or oval, e.g. | 21 |
| Octagon part | 12 |
| Octagon, e.g. | 13 |
| Octagonal order | 15 |
| Octagonal road sign | 19 |
| Octagonal road sign, in Arles | 29 |
| Octagonal sign | 14 |
| Octagonal street sign | 21 |
| Octagonal traffic sign | 22 |
| Octagonal warning | 17 |
| Octagonal-sign command | 22 |
| Octagonal-sign word | 19 |
| Octagons, hexagons, etc. | 24 |
| Octal system | 12 |
| Octane Booster brand | 20 |
| Octane rating sites | 19 |
| Octave | 6 |
| Octave followers | 16 |
| Octave followers, in sonnets | 28 |
| Octave of a feast | 17 |
| Octave twelfths | 15 |
| Octave's counterpart in a sonnet | 36 |
| Octave, e.g. | 12 |
| Octaves | 7 |
| Octaves' followers in sonnets | 33 |
| Octavia's emperor-husband | 29 |
| Octavia's husband | 21 |
| Octavia's offer? | 20 |
| Octavia's spouse | 20 |
| Octavia, to Nero | 16 |
| Octavian's foe | 18 |
| Octavian's wife | 19 |
| Octavio Paz book | 16 |
| Octavus Roy ___ | 15 |
| Octet | 5 |
| Octet "a-milking" in a Christmas song | 47 |
| Octet followers, in Italian sonnets | 35 |
| Octet member with the shortest name | 35 |
| Octet minus one | 15 |
| Octet number | 12 |
| Octet of black squares in the middle of this grid, typographically | 66 |
| Octet plus one | 14 |
| Octet's peculiarity? | 24 |
| Octet: It. | 10 |
| Octets | 6 |
| Octo | 4 |
| Octo plus one | 13 |
| October 13, 2008 celebration | 28 |
| October 15, e.g. | 16 |
| October 15, for example | 23 |
| October 15th, e.g. | 18 |
| October 15th, for example | 25 |
| October 17, 1777 | 16 |
| October 19, 1781 | 16 |
| October 1914 battle site | 24 |
| October 1914's Battle of the ___ | 36 |
| October 1962 chart-topper heard every October since | 51 |
| October 2005 celebrators | 24 |
| October 2008 bailout provider: Abbr. | 36 |
| October 2013 erupter | 20 |
| October 29, 1929 | 16 |
| October 31 activity | 19 |
| October 31 alternative | 22 |
| October 31 costume | 18 |
| October 31 drink | 16 |
| October 31 handout | 18 |
| October 31 option | 17 |
| October 31 shout | 16 |
| October ad target | 17 |
| October ad verb | 15 |
| October alternative | 19 |
| October and November? | 21 |
| October announcement | 20 |
| October attraction | 18 |
| October baseball letters since 1969 | 35 |
| October beverage | 16 |
| October beverages | 17 |