| Marathoners' pre-race intake, perhaps | 41 |
| Marble bridge over the Grand Canal | 34 |
| Marble ___ ("Seinfeld" prop) | 38 |
| Marble-producing Tuscany commune | 32 |
| Marc Anthony "I ___ Know" | 35 |
| Marc Anthony "___ to Know" | 36 |
| Marc Anthony's wife, casually | 33 |
| Marc Antony's adjective for Brutus | 38 |
| Marc Antony's love, familiarly | 34 |
| Marc Antony's love, for short | 33 |
| Marc Mezvinsky, to Bill and Hillary | 35 |
| Marc Price, on "Family Ties" | 38 |
| Marc who sang "Walking in Memphis" | 44 |
| Marcel playing sport around university (6) | 42 |
| Marcello Mastroianni's home town | 36 |
| March 2012 ABC debut with Kristin Chenoweth | 43 |
| March 25, in the Christian calendar | 35 |
| March 28, 2009 event that made many homes go dark | 49 |
| March event, in more ways than one | 34 |
| March Hare's offering to Alice | 34 |
| March honoree (with an aptly numbered clue) | 43 |
| March hoops tourney, with "the" | 41 |
| March Madness arbiter, for short | 32 |
| March Madness, with "the" | 35 |
| March of Dimes' original crusade | 36 |
| March that emulates "Living Dead" films | 49 |
| March who hosted "The $64,000 Question" | 49 |
| March's "Big Dance" org. | 38 |
| March's "The Bad ___" | 35 |
| March's "The ___ Seed" | 36 |
| March, 2006 ceremony, with "the" | 42 |
| Marchand, Pelletierand Trudeau, e.g. | 36 |
| Marcher's instrument, perhaps | 33 |
| Marches in protest outside a workplace | 38 |
| Marchese d'___ (Italian nobleman) | 37 |
| Marching band leader from Paris? | 32 |
| Marching band percussion instruments | 36 |
| Marching band uniform part, perhaps | 35 |
| Marching band's music holder | 32 |
| Marching bands often perform during them | 40 |
| Marching ___ (Midwest college band) | 35 |
| Marcia and Felicity's co-star | 33 |
| Marcie calls her "sir" | 32 |
| Marco Island's locale (abbr.) | 33 |
| Marco Polo's original heading | 33 |
| Marconi's disputed invention | 32 |
| Marcus ___ Hanna, McKinley adviser | 34 |
| Marcuse's "___ and Civilization" | 46 |
| Marcy Playground: "___ and Candy" | 43 |
| Mardi Gras city's Amtrak code | 33 |
| Mardi Gras destination, with "the" | 44 |
| Mardi Gras setting, with "the" | 40 |
| Mardi, as in 'Mardi Gras' | 33 |
| Marechal ___, yellow climbing rose | 34 |
| Maren of "Battlestar Galactica" | 41 |
| Margaret Atwood novel "___ and Crake" | 47 |
| Margaret Mitchell classic, briefly | 34 |
| Margaret Mitchell masterwork, initially | 39 |
| Margaret Mitchell's best-seller | 35 |
| Margaret Mitchell's birthplace | 34 |
| Margaret Mitchell's Pulitzer winner | 39 |
| Margaret Mitchell's Scarlett | 32 |
| Margaret of "Coming of Age in Samoa" | 46 |
| Margaret of "The Color Purple" | 40 |
| Margaret of sci-fi and other genres | 35 |
| Margaret Rutherford film portrayal | 34 |
| Margaret Thatcher supporter in Scotland Yard? | 45 |
| Margaret Thatcher's middle name | 35 |
| Margaret Whiting tune of '44 | 32 |
| Margaret ___, soprano who joined the Met in 1974 | 48 |
| Margaret's father's monogram | 36 |
| Margaret, to the Prince of Wales | 32 |
| Margarie might be described thus | 32 |
| Margarine, vis-à-vis butter | 34 |
| Marge and Homer's middle child | 34 |
| Marge Bouvier's married name | 32 |
| Marge Simpson's father-in-law | 33 |
| Marge Simpson's mother-in-law | 33 |
| Marge Simpson's old flame ___ Ziff | 38 |
| Marge who owned the Cincinnati Reds | 35 |
| Marge's sister, to Bart Simpson | 35 |
| Margery Williams book with The | 34 |
| Margin of victory at the Preakness | 34 |
| Margin of victory at the track, perhaps | 39 |
| Margin of victory, at Assiniboia Downs | 38 |
| Marginally makes (with "out") | 39 |
| Margins of victory, in horse races | 34 |
| Margolin of "David and Lisa" | 38 |
| Margot Fonteyn and Agatha Christie | 34 |
| Margot's "Superman" role | 38 |
| Margot’s “Superman” role | 36 |
| Margret and H. A. who created Curious George | 44 |
| Margret and H. A., creators of Curious George | 45 |
| Maria and Irina's sister, in a Chekhov play | 47 |
| Maria Edgeworth's "Castle ___" | 44 |
| Maria McKee country rockers ___ Justice | 39 |
| Maria Muldaur's "___ Woman" | 41 |
| Maria Shriver, to John F. Kennedy | 33 |
| Maria __, former queen of Hungary | 33 |
| Maria __, the last House of Habsburg ruler | 42 |