| October Films | October Firm | October First Antifascist Resistance Group |
| October Gale | October Gale (film) | October Gale of 1841 |
| October Gallery | October Grey | October Group |
| October Group (constructivism) | October Group (disambiguation) | October guard |
| October Guard | October Hargeisa-Bosaso bombings | October Hargeisa–Bosaso bombings |
| October Heat | October Holiday | October Horse |
| October horse | October Horse festival | October in Kragujevac Memorial Park |
| October in the Railroad Earth | October incident | October Incident |
| October is the Kindest Month | October Island | October lady's tresses |
| October Language | October League | October League (Marxist-Leninist) |
| October League (Marxist–Leninist) | October League Cup | October Lewis |
| October London | October Manifesto | October March |
| October missile | October Missile | October missiles |
| October Missiles | October Moon | October Moth |
| October Mountain | October Mountain State Forest | October Netherlands Riots |
| October nine | October Nine | October Noir |
| October November | October Offensive of the Central Lithuanian Army | October Okrug |
| October Palace | October Palace of Culture | October Palace, Kiev |
| October Palace, Kyiv | October Park | October park (Rostov-on-Don) |
| October Park (Rostov-on-Don) | October Parliament attack | October Passed Me By |
| October Project | October project | October Protest Movement in Iraq |
| October Protocol | October Rage | October Railway |
| October railway | October Rain | October Raion, Dnipropetrovsk |
| October Rebellion | October Restoration | October Review |
| October Revolution | October revolution | October Revolution (battleship) |
| October Revolution (disambiguation) | October Revolution (Sudan) | October Revolution class motorship |
| October Revolution Day | October Revolution Day Parade | October Revolution House of Culture |
| October Revolution in Jazz | October Revolution Island | October Revolution Locomotive Works |
| October Revolution of 1917 | October Revolution Parade | October Revolution Park (Rostov-on-Don) |
| October Riots | October road | October Road |
| October Road (2002 album) | October Road (album) | October Road (disambiguation) |
| October Road (James Taylor album) | October Road (TV series) | October Road Tour |
| October Rust | October seventh | October Skies |
| October Sky | October sky | October Sky (band) |
| October Sky (book) | October Sky (disambiguation) | October Sky (novel) |
| October Sky EP | October Sky EP (album) | October Sky: The Homer Hickam Story |
| October Socialist Revolution | October Song | October Square, Minsk |
| October square, Minsk | October Stakes | October Storm |
| October Storm (disambiguation) | October suprise | October Surprise |
| October surprise | October Surprise (1980) | October Surprise (Law & Order: Special Victims Unit) |
| October Surprise (The Politician) | October Surprise conspiracy | October Surprise Conspiracy |
| October surprise conspiracy | October surprise conspiracy theory | October Surprise conspiracy theory |
| October Surprise Storm | October surprises | October surprize |
| October Swimmer | October the 22nd Scud missile attack | October the 31st (The Fall Guy episode) |
| October the 31st (The Fall Guy) | October the First Is Too Late | October Tide |
| October Tour | October University for Modern Sciences and Arts | October war |
| October War | October War (wargame) | October War of 1973 |
| October War Panorama | October War: Doctrine and Tactics in the Yom Kippur Conflict, 1973 | October War: Tactical Armored Combat in the Yom Kippur Conflict |
| October Yushin | October Yusin | October'56 |
| October's Baby | October's Very Own | October, 1914 |
| October, Jonathan | October, Victoria | October-class missile boat |
| October-December 1590 papal conclave | October-December 1917 Politburo of the Russian Social Democratic Labour Party (Bolsheviks) | October-December 2020 Polish protests |
| October-November 2016 UK Independence Party leadership election | October-November 2020 Polish protests | October-November 2021 Sudanese coup d'état |
| October-November 2021 Sudanese coup d'état attempt | October-November 2022 nationwide missile strikes on Ukraine | October-November 2023 Jenin incursion |
| October: Ten Days That Shook the World | October: Ten Days That Shook The World | October–December 1590 papal conclave |
| October–December 1917 Politburo of the Russian Social Democratic Labour Party (Bolsheviks) | October–December 2020 Polish protests | October–November 2016 UK Independence Party leadership election |
| October–November 2020 Polish protests | October–November 2021 Sudanese coup d'état | October–November 2021 Sudanese coup d'état attempt |
| October–November 2022 nationwide missile strikes on Ukraine | Octoberfest | Octoberfest beer |
| Octoberfest Cincinnati | Octoberfestivities | Octobering |
| Octoberist | Octoberman | Octoberon |
| OctoberTrek | Octoblepharaceae | Octoblepharum |
| Octobot | Octobot (disambiguation) | Octobot (robot) |
| Octobre | Octobre (album) | Octobre, Daniel |
| Octobri mense | Octobri Mense | Octobriana |
| Octobris | Octobrist | Octobrist Party |
| Octobrist party | Octobrists | Octocaine |
| Octocaine-100 | Octocaine-50 | OctoCamo |
| Octocamo | Octocannoididae | Octocat |
| Octocat Adventure | Octocentenary | Octocentennial |
| Octocephaly | Octoceras | Octochaetidae |
| Octochaetus | Octochaetus multiporus | Octochamps |
| Octochara | Octochlothiepin | Octochlothiepine |
| Octoclinis | Octoclothepin | Octoclothepine |
| Octoclothiepin | Octoclothiepine | Octocog alfa |
| Octocon | Octocontra-alto clarinet | Octocontra-bass clarinet |
| Octocontrabass clarinet | Octocontrabass Recorder | Octocontrabass saxophone |
| Octocontralto clarinet | Octocopter | Octocoral |
| Octocorallia | Octocorals | Octocore |
| Octocrylene | Octocube | Octodad |
| Octodad 2 | Octodad: Dadliest Catch | Octode |
| Octodecaborane | Octodecagon | Octodecillion |
| Octodecimal | Octodiceras hydropogon | Octodon |
| Octodon (plant genus) | Octodon bridgesi | Octodon bridgesii |
| Octodon degus | Octodon lunatus | Octodon pacificus |
| Octodon ricardojeda | Octodont | Octodontid |
| Octodontidae | Octodontids | Octodontoidea |
| Octodontomys | Octodontomys gliroides | Octodontotherium |
| Octodrine | Octodur | Octodure |
| Octoduris | Octodurum | Octodurus |
| Octoechos | Octoechos (liturgical text) | Octoechos (liturgy) |
| Octoekhos | Octofinal | Octofinals |
| Octofone | OctoFrost Group | Octogeddon |
| Octogen | Octogenarian | Octogenarianism |
| Octogenarians | Octogesima adveniens | Octogesima Adveniens |
| Octogesimal | Octogesimal division | Octogintacentillion |
| Octogintillion | Octoglena | Octoglena anura |
| Octoglena bivirgata | Octogomphus | Octogomphus specularis |
| Octogon | Octogon (album) | Octogonal |
| Octogonia | Octogoniella | Octographic |
| Octohedra | Octohedral | Octohedron |
