| Ottavi | Ottavia | Ottavia Busia |
| Ottavia Cestonaro | Ottavia Penna | Ottavia Penna Buscemi |
| Ottavia Piccolo | Ottavia Vitagliano | Ottavianello |
| Ottaviani | Ottaviani Intervention | Ottaviano |
| Ottaviano (disambiguation) | Ottaviano (name) | Ottaviano - San Pietro (Rome Metro) |
| Ottaviano - San Pietro - Musei Vaticani | Ottaviano - San Pietro - Musei Vaticani (Rome Metro) | Ottaviano Andriani |
| Ottaviano – San Pietro – Musei Vaticani | Ottaviano – San Pietro – Musei Vaticani (Rome Metro) | Ottaviano Bargellini |
| Ottaviano Campofregoso | Ottaviano Canevari | Ottaviano Capece |
| Ottaviano Carafa | Ottaviano Conti di Segni | Ottaviano da Faenza |
| Ottaviano Dandini | Ottaviano de Medici (b. 1957) | Ottaviano de' Medici |
| Ottaviano de' Medici (b. 1957) | Ottaviano de' Medici (born 1957) | Ottaviano de' Medici, 1 Prince of Ottajano |
| Ottaviano de' Medici, 1st Prince of Ottajano | Ottaviano de'Petrucci | Ottaviano degli Ubaldini |
| Ottaviano dei Conti di Segni | Ottaviano dei conti di Segni | Ottaviano dei Crescenzi Ottaviani |
| Ottaviano dei Crescenzi Ottaviani di Monticelli | Ottaviano dei Petrucci | Ottaviano Del Turco |
| Ottaviano della Raverta | Ottaviano della Rovere | Ottaviano di Cosimo de' Medici Ottaviano (1957) |
| Ottaviano Di Martino Di Nello | Ottaviano di Paoli | Ottaviano Fabrizio Mossotti |
| Ottaviano Fregoso | Ottaviano Garzadori | Ottaviano Garzadorio |
| Ottaviano Garzadoro | Ottaviano Ianella | Ottaviano Iannella |
| Ottaviano Janella | Ottaviano Jannella | Ottaviano Maria Sforza |
| Ottaviano Mascherino | Ottaviano Menni | Ottaviano Nelli |
| Ottaviano Nonni | Ottaviano Paravicini | Ottaviano Petrucci |
| Ottaviano Preconio | Ottaviano Preconio (bishop of Cefalù) | Ottaviano Querini |
| Ottaviano Raggi | Ottaviano Raverta | Ottaviano Riario |
| Ottaviano Rinuccini | Ottaviano Tenerani | Ottaviano Ubaldino |
| Ottaviano Vannini | Ottaviano Zuccari | Ottaviano-Fabrizio Mossotti |
| Ottavinello | Ottavino | Ottavino (disambiguation) |
| Ottavino spinet | Ottavino, Adam | Ottavio |
| Ottavio Accoramboni | Ottavio Acquaviva d'Aragona | Ottavio Acquaviva d'Aragona (1560-1612) |
| Ottavio Acquaviva d'Aragona (1560–1612) | Ottavio Acquaviva d'Aragona (1609-1674) | Ottavio Acquaviva d'Aragona (1609–1674) |
| Ottavio Acquaviva d'Aragona (iuniore) | Ottavio Acquaviva d'Aragona (seniore) | Ottavio Alessi |
| Ottavio Amiconi | Ottavio Amigoni | Ottavio Andriani |
| Ottavio Assarotti | Ottavio Bandini | Ottavio Barbieri |
| Ottavio Barone | Ottavio Barsanti | Ottavio Baussano |
| Ottavio Bianchi | Ottavio Bollea | Ottavio Bottecchia |
| Ottavio Briccola | Ottavio Broglia | Ottavio Bugatti |
| Ottavio Cagiano de Azevedo | Ottavio Cinquanta | Ottavio Codogno |
| Ottavio Cogliati | Ottavio Compagnoni | Ottavio Corsini |
| Ottavio Crepaldi | Ottavio Dantone | Ottavio Dazzan |
| Ottavio De Liva | Ottavio Fantoni | Ottavio Farnese |
| Ottavio Farnese (1598-1643) | Ottavio Farnese (1598–1643) | Ottavio Farnese, Duke of Parma |
| Ottavio Farnese, duke of Parma | Ottavio Fürst Piccolomini | Ottavio Ferrari |
| Ottavio Forte | Ottavio Gaetani | Ottavio Gentile Oderico |
| Ottavio Jemma | Ottavio Leoni | Ottavio Lioni |
| Ottavio Mascherino | Ottavio Mastrojanni | Ottavio Michelini |
| Ottavio Mirto Frangipani | Ottavio Misefari | Ottavio Missoni |
| Ottavio Missoni (athlete) | Ottavio Morgia | Ottavio Orsini |
| Ottavio Ottavi | Ottavio Padovano | Ottavio Panciroli |
| Ottavio Panunzi | Ottavio Paravicini | Ottavio Petrucci |
| Ottavio Piccinardi | Ottavio Piccolomini | Ottavio Pittoni |
| Ottavio Pratesi | Ottavio Profeta | Ottavio Quattrocchi |
| Ottavio Ragni | Ottavio Ridolfi | Ottavio Rinuccini |
| Ottavio Saraceni | Ottavio Scarlattini | Ottavio Scotti |
| Ottavio Semini | Ottavio Semino | Ottavio Serena |
| Ottavio Tiby | Ottavio Tronsarelli | Ottavio Vannini |
| Ottavio Viviani | Ottavio Ziino | Ottavio, Duca D'amalfi, Reichsfurst Piccolomini-Pieri |
| Ottavio, Duke of Parma | Ottawa | Ottawa & New York Railway |
| Ottawa (1814 ship) | Ottawa (Côte d'Ivoire) | Ottawa (City of) |
| Ottawa (City of) (electoral district) | Ottawa (community), Wisconsin | Ottawa (County of) |
| Ottawa (County of) (electoral district) | Ottawa (disambiguation) | Ottawa (electoral district) |
| Ottawa (First Nation) | Ottawa (IL) | Ottawa (independent pro baseball) |
| Ottawa (KS) | Ottawa (ON) | Ottawa (Ontario electoral district) |
| Ottawa (Ontario provincial electoral district) | Ottawa (Outaouais) | Ottawa (people) |
| Ottawa (Province of Canada electoral district - Canada East) | Ottawa (provincial electoral district) | Ottawa (Quebec provincial electoral district) |
| Ottawa (shipwreck) | Ottawa (town), Wisconsin | Ottawa (tribe) |
| Ottawa (tug) | OTTAWA (Tug) Shipwreck Site | Ottawa (Union) Train Station |
| Ottawa (VIA station) | Ottawa - Glandorf High School | Ottawa - Glandorf High School (Ottawa, Ohio) |
| Ottawa - Glandorf Local School District | Ottawa - Glandorf Local School District, Putnam County, Ohio | Ottawa 10K |
| Ottawa 10K Road Race | Ottawa 67's | Ottawa 67’s |
| Ottawa 67s | Ottawa A's | Ottawa Aberdeens |
| Ottawa Aces | Ottawa agreement | Ottawa Agreement |
| Ottawa Agreement (disambiguation) | Ottawa Agreements | Ottawa Agreements of 1932 |
| Ottawa Airport | Ottawa airport | Ottawa Airport, Ontario |
| Ottawa and District Amateur Hockey Association | Ottawa and District Labour Council | Ottawa and New York Railway |
| Ottawa and Prescott Railway | Ottawa ankle rule | Ottawa ankle rules |
| Ottawa Ankle Rules | Ottawa architecture | Ottawa area codes |
| Ottawa Arena | Ottawa Art Gallery | Ottawa Athletics |
| Ottawa Auditorium | Ottawa Avenue Cemetery | Ottawa – Glandorf Local School District |
| Ottawa – Glandorf Local School District, Putnam County, Ohio | Ottawa Bach Choir | Ottawa Baseball |
| Ottawa Baseball Stadium | Ottawa Basilica | Ottawa Beach Historic District |
| Ottawa Black Bears | Ottawa Black Film Festival | Ottawa BlackJacks |
| Ottawa Blackjacks | Ottawa Blues Society | Ottawa Bluesfest |
| Ottawa Board of Control | Ottawa Board of Education | Ottawa Board of Trade |
| Ottawa Book Award | Ottawa Book Awards | Ottawa Bowel Preparation Scale |
| Ottawa bowel preparation scale | Ottawa Braves | Ottawa Braves baseball |
| Ottawa Braves basketball | Ottawa Braves football | Ottawa Braves men's basketball |
| Ottawa Braves men's soccer | Ottawa Braves track and field | Ottawa Brook, Nova Scotia |
| Ottawa Bus Central Station | Ottawa bus strike | Ottawa bus terminal |
| Ottawa Bus Terminal | Ottawa Bus-Train Crash | Ottawa bus-train crash |
| Ottawa Business Journal | Ottawa By-law Services | Ottawa Can-Am League team |
| Ottawa Canadian Film Festival | Ottawa Canadian Football League team | Ottawa Canadian Football League team (disambiguation) |
| Ottawa Canadians | Ottawa canal | Ottawa Capital Canucks |
| Ottawa Capital Region | Ottawa Capitals | Ottawa Car Company |
| Ottawa Car Manufacturing Company | Ottawa Carleton Catholic School Board | Ottawa Carleton District School Board |
| Ottawa cathedral | Ottawa Catholic School Board | Ottawa CBC Building |
| Ottawa Center, Michigan | Ottawa Central Bus Station | Ottawa Central Railway |
| Ottawa Central Station | Ottawa Centre | Ottawa Centre (disambiguation) |
| Ottawa Centre (federal electoral district) | Ottawa Centre (provincial electoral district) | Ottawa CFL |
| Ottawa CFL team | Ottawa Chamber Music Festival | Ottawa Chamberfest |
| Ottawa Champions | Ottawa Charter | Ottawa Charter for Health Promotion |
| Ottawa chief Pontiac | Ottawa Children's Hospital | Ottawa Citizen |
