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Washington D.C. Area Restaurants
Beginning with "O"
| Restaurant Name | Cuisine | Neighborhood |
| O'Brien's Pit Barbecue | Barbeque | Rockville |
| O'Donnell's Sea Grill | Seafood | Gaithersburg |
| O'Malley's Irish Pub | American | Sterling |
| O'Malley's Irish Sports Pub | American | Tysons Corner |
| O'tasty | Chinese | |
| Oakville Grille and Wine Bar | American | Bethesda |
| Obee's Soup-Salad-Subs | Soups & Salads | Vienna |
| Obee's Soup-Salad-Subs | Soups & Salads | Germantown |
| Obelisk | Italian | Adams Morgan |
| Obi Sushi | Japanese | Reston |
| Ocean City Fries & Chargrill | Fast Food | Kensington |
| Odeon Cafe | Italian | Dupont Circle |
| Olazzo | Italian | Bethesda |
| Olazzo | Italian | Silver Spring |
| Old Angler's Inn | American - Casual | Potomac |
| Old City Cafe of Jerusalem | Middle Eastern | |
| Old Country Buffet | Buffet | Fairfax |
| Old Country Buffet | American - Casual | |
| Old Country Buffet | American - Casual | Gaithersburg |
| Old Country Buffet | American - Casual | Waldorf |
| Old Country Buffet | American - Casual | Alexandria |
| Old Country Buffet | American - Casual | Fredericksburg |
| Old Country Buffet | American - Casual | Manassas |
| Old Country Buffet | American - Casual | Woodbridge |
| Old Ebbitt Grill | American | Downtown Washington |
| Old Europe Restaurant | German | District of Columbia |
| Old Hickory Grille | Barbeque | |
| Old Hickory Steakhouse | Steak | Oxon Hill |
| Olive Garden | Italian | Manassas |
| Olive Garden | Italian | Sterling |
| Olive Garden | Italian | Waldorf |
| Olive Garden | Italian | Bowie |
| Olive Garden | Italian | Falls Church |
| Olive Garden | Italian | Vienna |
| Olive Garden | Italian | Woodbridge |
| Olive Garden | Italian | Fredericksburg |
| Olive Garden | Italian | Fairfax |
| On The Border | Mexican | Reston |
| On The Border | Mexican | Woodbridge |
| On The Border | Mexican | Vienna |
| On The Border | Mexican | Bowie |
| On The Border | Mexican | Rockville |
| One Fish, Two Fish | Seafood | |
| One Lounge | Continental | Dupont Circle |
| Open Kitchen | American | Falls Church |
| Oriental East | Asian | Silver Spring |
| Oriental Express | Chinese | Centreville |
| Oro Pomodoro | Italian | Rockville |
| Otani | Japanese | Chantilly |
| Outback Steakhouse | Steak | Germantown |
| Outback Steakhouse | Steak | Silver Spring |
| Outback Steakhouse | Steak | California |
| Outback Steakhouse | Steak | Waldorf |
| Outback Steakhouse | Steak | La Plata |
| Outback Steakhouse | Steak | Oxon Hill |
| Outback Steakhouse | Steak | Bowie |
| Outback Steakhouse | Steak | Bethesda |
| Outback Steakhouse | Steak | Prince Frederick |
| Outback Steakhouse | Steak | Upper Marlboro |
| Outback Steakhouse | Steak | Woodbridge |
| Outback Steakhouse | Steak | Herndon |
| Outback Steakhouse | Steak | Fredericksburg |
| Outback Steakhouse | Steak | Vienna |
| Outback Steakhouse | Steak | Winchester |
| Outback Steakhouse | Steak | Sterling |
| Outback Steakhouse | Steak | Arlington |
| Outback Steakhouse | Steak | Clifton |
| Outback Steakhouse | Steak | Warrenton |
| Outback Steakhouse | Steak | Springfield |
| Outback Steakhouse | Steak | Alexandria |
| Outback Steakhouse | Steak | Fairfax |
| Outback Steakhouse | Steak | La Plata |
| Outback Steakhouse | Steak | Hyattsville |
| Ovations at Wolf Trap | American | Vienna |
| Overwood | American | Alexandria |
| Oya Restaurant & Lounge | International | Downtown Washington |
| Oyamel | Mexican | Downtown Washington |
| Oyamel | Mexican | Arlington |
| The Occidental | American | Downtown Washington |
| The Oceanaire Seafood Room | Seafood | Capitol Hill |
| The Original Pancake House | American - Casual | Bethesda |
| The Original Pancake House | American - Casual | Rockville |
| The Original Pancake House | American - Casual | Falls Church |
| The Oval Room | American | Downtown Washington |
| The Oz Restaurant | Fusion | Bethesda |
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