| Only Beach Boys #1 hit after 1966 | 33 |
| Only batted, briefly | 20 |
| Only baseball player to hit a home run in every inning from the first through the 16th | 86 |
| Only ballplayer to hit 60 homers in a season three times | 56 |
| Only average | 12 |
| Only author represented in every major division of the Dewey Decimal System | 75 |
| Only astrological sign with an inanimate symbol | 47 |
| Only asteroid visible with the naked eye | 40 |
| Only as __ resort | 17 |
| Only ape to circle the earth | 28 |
| Only amount that satisfies the greedy | 37 |
| Only American with more homers than Ruth | 40 |
| Only American star of "Doctor Zhivago" | 48 |
| Only American Leaguer on the All-Star team every year of the 1950s | 66 |
| Only American League player to win a batting crown without hitting a home run | 77 |
| Only album attributed to Paul and Linda McCartney | 49 |
| Only African-American male to win Wimbledon | 43 |
| Only Adam and Eve lacked them | 29 |
| Only actor to win a comedy and drama Emmy for the same character | 64 |
| Only actor to speak in Mel Brooks' "Silent Movie" | 63 |
| Only about 10% of it is visible | 31 |
| Only about 10 percent of it is visible | 38 |
| Only able to think in the short term | 36 |
| Only a stone's throw away | 29 |
| Only a small number | 19 |
| Only a memory | 13 |
| Only a little off | 17 |
| Only a few get them | 19 |
| Only a few get it | 17 |
| Only a few | 10 |
| Only a drug of forgetfulness? | 29 |
| Only a day away, say | 20 |
| Only a bit in debt, perhaps | 27 |
| Only a bit | 10 |
| Only 20th-century prez without a coll. degree | 45 |
| Only 20th-century president whose three distinct initials are in alphabetical order | 83 |
| Only "Winnie the Pooh" human | 38 |
| Only "Garfield" character who doesn't use a speech bubble | 71 |
| Only | 4 |
| Onlookers | 9 |
| Onlooker | 8 |
| ONLINE? | 7 |
| Online-only publication | 23 |
| Online __ print | 15 |
| Online zine | 11 |
| Online yuk | 10 |
| Online world where people live and pay taxes in 2010, according to Tom Clancy's "Net Force" series | 112 |
| Online workshop | 15 |
| Online weekly, e.g. | 19 |
| Online voice calling service | 28 |
| Online VIPs | 11 |
| Online VIP | 10 |
| Online view intro | 17 |
| Online video source | 19 |
| Online video site | 17 |
| Online video of a 1960s president talking to aliens? | 52 |
| Online video equipment | 22 |
| Online user's self-image | 28 |
| Online used vehicle dealer | 26 |
| Online urban guide | 18 |
| Online update format, for short | 31 |
| Online university suffix | 24 |
| Online university staff? | 24 |
| Online university extension | 27 |
| Online TV site | 14 |
| Online troublemaker | 19 |
| Online travel reservation | 25 |
| Online tracking devices | 23 |
| Online tip jar (just sayin') | 32 |
| Online time stamp | 17 |
| Online threats | 14 |
| Online technical news source | 28 |
| Online tech-news source | 23 |
| Online tech news source | 23 |
| Online tech news site | 21 |
| Online tech news resource | 25 |
| Online talk site | 16 |
| Online talk | 11 |
| Online surfers, e.g. | 20 |
| Online suffix with Net | 22 |
| Online subscription inits. | 26 |
| Online stores, collectively | 27 |
| Online store with the slogan "Childhood Dreams Delivered" | 67 |
| Online store option | 19 |
| Online store offering | 21 |
| Online store | 12 |
| Online stock site | 17 |
| Online stock picker's option | 32 |
| Online status update limited to 140 characters | 46 |
| Online starting point | 21 |
| Online stand-in | 15 |
| Online spender's convenience | 32 |
| Online source for TV shows | 26 |
| Online software come-on | 23 |
| Online social session | 21 |
| Online social appointment | 25 |
| Online slang | 12 |
| Online skirmish? | 16 |
| Online site where users may write and edit texts | 48 |
| Online site | 11 |