| Irish playwright who wrote "The Shadow of a Gunman" | 61 |
| Irish playwright who wrote "Cock-a-Doodle Dandy" | 58 |
| Irish folk song that was a Grammy-winning vehicle for Metallica | 63 |
| Irish ensemble with five singers, a fiddler, and a few PBS specials | 67 |
| Irish dramatist Hugh, who won a Tony for "Da" | 55 |
| Irene's business transaction? (1931, 1936, 1937, 1939, 1948) | 64 |
| Iranian city that's the birthplace of Omar Khayyám | 57 |
| iPhone assistant who says that "42" is the meaning of life | 68 |
| Iowa setting for the League of Sofa Manufacturers convention? | 61 |
| Involving New York, New Jersey, and Connecticut, for example | 60 |
| Involving folk with the highest security clearance, say | 55 |
| Inviting words before "Want to come over?" | 52 |
| Investment money, briefly, or this puzzle's theme, backward | 63 |
| Investigator who finds someone's birth mother, say | 54 |
| Inventor who said "There is no substitute for hard work" | 66 |
| Inventor who received a lifetime achievement Grammy in 1970 | 59 |
| Inventor played by Bowie in "The Prestige" | 52 |
| Inventor dubbed "the patron saint of modern electricity" | 66 |
| Inventor after whom a Yale residential college is named | 55 |
| Invention that prompted NBC to adopt the peacock logo | 53 |
| Invention credited to Bartolomeo Cristofori circa 1700 | 54 |
| Invention by Otto Lilienthal in which he crashed to his death | 61 |
| Introduce a new line of accessories for skateboarders? | 54 |
| Intro to "mania" [IMPORTANT: SEE NOTE ABOVE.] | 55 |
| Intro French class for a fluent French speaker, e.g. | 52 |
| Intrepid Sea, Air & Space Museum exhibit, for short | 55 |
| Intolerable ___, one cause of the American Revolution | 53 |
| Intl. group whose initials in English and French are reversed | 61 |
| Intl. group whose biennial conferences are focuses of protest | 61 |
| Intl. group that issued the controversial MacBride report in 1980 | 65 |
| Interview With The ___, 1994 Hallowe'en heart stopper | 58 |
| Interstellar cloud in the Sagittarius area of the Milky Way | 59 |
| Interrupt (whose initials spell "honk a horn") | 56 |
| Internet writing system that popularized "pwn'd" | 62 |
| Internet slang system sometimes written with 3's | 52 |
| Internet letters, and a hint to this puzzle's theme | 55 |
| Internet giant with an exclamation point in its name | 52 |
| International writers' org. with appropriate initials | 57 |
| International Workingmen's Association organizer | 52 |
| International Tennis Hall of Fame inductee the same year as Guillermo | 69 |
| International court site (with ''The'') | 55 |
| International Court of Justice site, with "The" | 57 |
| International Court of Justice site (with "The") | 58 |
| International Court of Justice city, with "The" | 57 |
| International company with the slogan "Home away from home" | 69 |
| Interjections used to express irritation or disbelief | 53 |
| Interjection when contemplating lions and tigers and bears | 58 |
| Interjection that comes from the Latin for "weary" | 60 |
| Interjection before "What can the matter be?" | 55 |
| Interior Secretary Hitchcock who served under McKinley and Roosevelt | 68 |
| Interfering words after ''poke one's'' | 58 |
| Interface developed for the Intel x86 family of microprocessors | 63 |
| Interested in headaches, puking, and bloodshot eyes? | 52 |
| Intended assassination victim of the Pisonian Conspiracy | 56 |
| Intelligence gp. doing controversial domestic surveillance | 58 |
| Insurance salesman Ryerson in "Groundhog Day" | 55 |
| Insurance industry name, with headquarters in a Boston tower | 60 |
| Insurance giant represented by a "spokesduck" | 55 |
| Insurance company with commercials featuring Dennis Haysbert | 60 |
| Insurance company with a duck mascot voiced by Gilbert Gottfried | 64 |
| Insurance company whose Twitter feed is run by a duck | 53 |
| Insurance company that gets you a quote in 15 minutes or less | 61 |
| Insurance company founded in 1936 for government employees | 58 |
| Insurance co. whose mascot is voiced by Gilbert Gottfried | 57 |
| Insurance category for cars, boats, fire damage, etc. | 53 |
| Instruments that literally mean "three flavor strings" | 64 |
| Instruments played by Yusef Lateef and Sufjan Stevens | 53 |
| Instruments in "The 5,000 Fingers of Dr. T" | 53 |
| Instruments for measuring minute differences in pressure | 56 |
| Instruments featured in the first of Bach's Brandenburg concertos | 69 |
| Instrument whose name means "little goose" | 52 |
| Instrument whose name derives from "high wood" | 56 |
| Instrument that often sits on the floor while played | 52 |
| Instrument on the Beatles' "Within You Without You" | 65 |
| Instrument on the Beatles' "Norwegian Wood" | 57 |
| Instrument often accompanied by a pair of small drums | 53 |
| Instrument of torture in Room 101 of "1984" | 53 |
| Instrument Merrill Garbus of tUnE-yArDs plays, for short | 56 |
| Instrument maker with an interlocking-tuning-forks logo | 55 |
| Instrument maker with a logo of interlocking tuning forks | 57 |
| Instrument in Schubert's "Trout Quintet" | 54 |
| Instrument honored in a Beaufort, South Carolina, museum | 56 |
| Instrument heard on Simon & Garfunkel's "Bookends" | 68 |
| Instrument heard on Cornershop's "Brimful of Asha" | 64 |
| Instrument heard on "Within You Without You" | 54 |
| Instrument heard in the Beach Boys' "Good Vibrations" | 67 |
| Instrument heard in Sonny & Cher's "I Got You Babe" | 69 |
| Instrument for determining the distance of an object | 52 |
| Instrument featured on Eddie Vedder's new album, casually | 61 |
| Instrument featured in Berlioz's "Harold in Italy" | 64 |
| Instrument depicted by the circled squares in this grid | 55 |
| Instrument called "an ill wind that nobody blows good" | 64 |
| Instrument bearing the coat of arms of France's Charles IX | 62 |
| Instrument "played" for a hairbrush microphone user | 61 |
| Instructional program for many a student traveling abroad: Abbr. | 64 |
| Instruction sometimes followed by "repeat" | 52 |
| Instruction on preparing a tiny Thanksgiving side dish | 54 |
| Instruction on a record executive's answering machine message? | 66 |
| Instruction for Johnny, in a "Breakfast Club" monologue | 65 |
| Institutions that elected officials shouldn't criticize | 59 |