| Online communications forum | 27 |
| Owner of Abbey Road Studios | 27 |
| Onetime Sheena Easton label | 27 |
| Overdo the stage directions | 27 |
| Ostrich's Aussie cousin | 27 |
| Off-road motorcycling event | 27 |
| Official language of Calif. | 27 |
| Official lang. of Mauritius | 27 |
| One-time Cardinal Slaughter | 27 |
| One of Adam's grandsons | 27 |
| Officer on a PT boat: Abbr. | 27 |
| Otolaryngologist, for short | 27 |
| Opposite of "exo" | 27 |
| One-named Irish folk singer | 27 |
| One hundred million decades | 27 |
| Org. in a war against grime | 27 |
| Officer's embellishment | 27 |
| One with good taste in food | 27 |
| One of Zeus's daughters | 27 |
| Obsolete "before" | 27 |
| One of several Danish kings | 27 |
| Olympic speed skater Heiden | 27 |
| Obama cabinet member Holder | 27 |
| One of five bodies of water | 27 |
| Ohio's Lake ___ College | 27 |
| O'Neill's ___ Smith | 27 |
| Only four-letter Great Lake | 27 |
| One of five great waterways | 27 |
| One of a well-known quintet | 27 |
| Old Buffalo-to-Albany canal | 27 |
| One of the Nielsen brothers | 27 |
| One of the Haliaeetus genus | 27 |
| One may be run during lunch | 27 |
| Olivia's co-star, often | 27 |
| One of the Celtic languages | 27 |
| One-named art deco designer | 27 |
| One of Kreskin's claims | 27 |
| O.T. book read during Purim | 27 |
| O.T. book named for a woman | 27 |
| Oft-used Latin abbreviation | 27 |
| One who makes art with acid | 27 |
| Old hospital administration | 27 |
| One of the Decade Volcanoes | 27 |
| Online brokerage since 1993 | 27 |
| One of Zeus's conquests | 27 |
| One of the Bayhs of Indiana | 27 |
| One in the first generation | 27 |
| Ontario's Premier Ernie | 27 |
| Oust for nonpayment of rent | 27 |
| Optometrist's offerings | 27 |
| One who no longer has life? | 27 |
| One of the brass, for short | 27 |
| Ones concerned with custody | 27 |
| Olympic Stadium team of old | 27 |
| Obtain through intimidation | 27 |
| Ornamental embroidered hole | 27 |
| One making sidelong glances | 27 |
| One being unsubtle, perhaps | 27 |
| One that shoots the breeze? | 27 |
| Offspring of bucks and does | 27 |
| Org. that stopped Dillinger | 27 |
| Org. formerly led by Hoover | 27 |
| Org. that can fine networks | 27 |
| One of WWII's Big Three | 27 |
| One of the great motivators | 27 |
| Outstanding accomplishments | 27 |
| One of baseball's Alous | 27 |
| One running a hot business? | 27 |
| Orders from absolute rulers | 27 |
| One who's beyond belief | 27 |
| Option in Polk's slogan | 27 |
| Over five million Europeans | 27 |
| Ogress in "Shrek" | 27 |
| Order after "aim" | 27 |
| One of Vulcan's spheres | 27 |
| Old chap's diner order? | 27 |
| Orlando's place (abbr.) | 27 |
| Olympic stadium centerpiece | 27 |
| One might make Spot scratch | 27 |
| Old pop duo ___ & Eddie | 27 |
| Obscurer of trees, for some | 27 |
| Old fur trader's locale | 27 |
| Officer Gannon's friend | 27 |
| One response to a challenge | 27 |
| One on a Facebook News Feed | 27 |
| One wanting a little extra? | 27 |
| Old Michael Jackson 'do | 27 |
| Overheat motherboards, e.g. | 27 |
| Org. providing arrangements | 27 |
| Oft-blown circuit component | 27 |
| Old Maid and charades, e.g. | 27 |
| One of the states of matter | 27 |
| One who talks, talks, talks | 27 |
| Old-time street illuminator | 27 |
| One of Arthur's knights | 27 |
| One that's passed along | 27 |
| Offspring's inheritance | 27 |
| One with star power?: Abbr. | 27 |
| One who makes a mark: Abbr. | 27 |
| One of a trio of black keys | 27 |