| Common Indian cooking ingredients | 33 |
| Common indulgence | 17 |
| Common inert gas | 16 |
| Common inert gas in the atmosphere | 34 |
| Common ingredient in Chinese dishes | 35 |
| Common ingredient in feta cheese | 32 |
| Common ingredient in Nigerian cuisine | 37 |
| Common inhalant | 15 |
| Common injuries among athletes | 30 |
| Common injury location | 22 |
| Common injury site | 18 |
| Common ink purchase | 19 |
| Common inscription, e.g. | 24 |
| Common insurance fraud | 22 |
| Common insurance fraud cause | 28 |
| Common intensifier | 18 |
| Common interest | 15 |
| Common interest group | 21 |
| Common interface that is a model for several squares in this puzzle | 67 |
| Common interjection | 19 |
| Common interjection in Shakespeare | 34 |
| Common interjections | 20 |
| Common Internet letters | 23 |
| Common internet message board phenomena | 39 |
| Common Internet symbol | 22 |
| Common Italian restaurant fixture | 33 |
| Common item | 11 |
| Common item in a purse | 22 |
| Common item in still-life paintings | 35 |
| Common item? | 12 |
| Common itemized deduction | 25 |
| Common IV filler | 16 |
| Common Japanese flavoring | 25 |
| Common java hr. | 15 |
| Common jazz chords | 18 |
| Common jazz combo | 17 |
| Common Jesuit school name | 25 |
| Common John | 11 |
| Common joiner | 13 |
| Common joke setting | 19 |
| Common jukebox inserts | 22 |
| Common key chain adornment | 26 |
| Common key signature | 20 |
| Common keyboard symbol | 22 |
| Common kitchen amenity | 22 |
| Common knee stain for kids | 26 |
| Common knowledge | 16 |
| Common Korean surname | 21 |
| Common lab tests | 16 |
| Common laboratory subject | 25 |
| Common landing site | 19 |
| Common language in Niger | 24 |
| Common language suffix | 22 |
| Common Lat. catchall | 20 |
| Common Latin abbr. | 18 |
| Common Latin notation | 21 |
| Common Latin phrase | 19 |
| Common Latin verb | 17 |
| Common Latin word | 17 |
| Common Latino newspaper name | 28 |
| Common lease length | 19 |
| Common lease span | 17 |
| Common legal phrase | 19 |
| Common legume | 13 |
| Common letters after @ | 22 |
| Common letters in an email address | 34 |
| Common level | 12 |
| Common liner note abbr. on a folk album | 39 |
| Common links | 12 |
| Common Lionel layout | 20 |
| Common liquor amount | 20 |
| Common list | 11 |
| Common list closer | 18 |
| Common list ender | 17 |
| Common list ender (abbr.) | 25 |
| Common listing of award finalists | 33 |
| Common literary device | 22 |
| Common literary theme | 21 |
| Common livestock feed | 21 |
| Common lizard | 13 |
| Common locales for film brawls | 30 |
| Common locket shape | 19 |
| Common London sight | 19 |
| Common loss after a breakup | 27 |
| Common lotion ingredient | 24 |
| Common Lower East Side sight, once | 34 |
| Common lowland sight | 20 |
| Common lumber dimensions | 24 |
| Common lunch holder | 19 |
| Common lunch hour | 17 |
| Common lunch meat | 17 |
| Common lunch order | 18 |
| Common lunch time | 17 |
| Common lunchbox fare, briefly | 29 |
| Common lunchbox sandwiches, informally | 38 |
| Common lunchtime | 16 |
| Common lyrical throw-ins | 24 |
| Common Maine tree | 17 |
| Common make-believe drink | 25 |
| Common makeup applicator | 24 |