- Abaza: сентябрь (sentjabrʲ)
- Abkhaz: цәыббра (cʷəbbra)
- Adyghe: ӏоныгъу (ʼwonəğʷu)
- Afrikaans: September (af)
- Alabama: hasiholtina istachákkàali
- Albanian: shtator m, britm (sq)
- Alutiiq: Qakiiyat Iraluat
- Amharic: ሰፕቴምበር (säptembär)
- Apache:
- Western Apache: Binestʼánchoh
- Arabic: سِبْتِمْبِر (ar) m (sibtimbir), سِبْتَمْبِر (ar) m (sibtambir), سَبْتَمْبَر (ar) m (sabtambar), أَيْلُول m (ʔaylūl)
- Egyptian Arabic: سبتمبر m (sebtamber)
- Aramaic:
- Assyrian Neo-Aramaic: ܐܝܼܠܘܿܠ f (īlōl)
- Armenian: սեպտեմբեր (hy) (september)
- Old Armenian: սեպտեմբեր (september)
- Aromanian: septemvriu, ayizmãciuni f, ghismãciuni f, stavru
- Asturian: septiembre (ast) m
- Atikamekw: Kakone pisimw
- Azerbaijani: sentyabr (az)
- Banjarese: Siptimbir
- Basque: irail (eu)
- Belarusian: ве́расень (be) m (vjérasjenʹ)
- Bengali: সেপ্টেম্বর (bn) (śepṭembor)
- Bislama: septemba
- Breton: Gwengolo (br), miz Gwengolo
- Bulgarian: септе́мври (bg) m (septémvri)
- Burmese: စက်တင်ဘာ (my) (caktangbha), ကိုးလ (kui:la.)
- Catalan: setembre (ca) m
- Central Dusun: Manom, Manom
- Chechen: Гезгмашан-бутт (Gezgmašan-butt)
- Cherokee: ᏚᎵᏍᏗ (dulisdi)
- Chichewa: Sepitembala
- Chinese:
- Cantonese: 九月 (gau2 jyut6)
- Dungan: җюйүә (ži͡uyüə)
- Hakka: 九月 (kiú-ngie̍t)
- Hokkien: 九月 (káu-go̍eh, káu-ge̍h, káu-gōe)
- Mandarin: 九月 (zh) (jiǔyuè)
- Chukchi: эʼйӈэйъилгын (ėʼjṇėjʺilgyn), ӄаанматйъэԓгын (qaanmatjʺėḷgyn)
- Chuvash: авӑн (avăn)
- Coptic: ⲥⲉⲡⲧⲉⲙⲃⲣⲓⲟⲥ (septembrios)
- Cornish: Gwynngala m, Gwydngala m
- Corsican: settembre (co)
- Crimean Tatar: sentâbr
- Czech: září (cs) n
- Dakota: Wiinapciŋwaŋka
- Danish: september (da) c
- Dhivehi: ސެޕްޓެމްބަރު (dv) (sepṭem̊baru)
- Dutch: september (nl) m
- Dzongkha: སྤྱི་ཟླ་དགུ་པ། (spyi zla dgu pa)
- Erzya: таштамков (taštamkov)
- Esperanto: septembro (eo), Septembro
- Estonian: september (et) sg, mihklikuu sg
- Ewe: Anyɔnyɔ, September
- Faroese: september m, septembur m
- Fijian: Seviteba
- Finnish: syyskuu (fi)
- French: septembre (fr) m
- Friulian: Setembar
- Fula: settaambur, sutambar
- Galician: setembro (gl) m
- Georgian: სექტემბერი (ka) (sekṭemberi)
- German: September (de) m, Scheiding (de) m
- Gilbertese: Tebetembwa
- Greek: Σεπτέμβριος (el) m (Septémvrios), Σεπτέμβρης (el) m (Septémvris), Τρυγητής m (Trygitís)
- Greenlandic: septembari
- Guaraní: jasyporundy
- Haitian Creole: septanm
- Hausa: Satumba (ha)
- Hawaiian: Kepakemapa
- Hebrew: סֶפְּטֶמְבֶּר (he) m (septémber)
- Hindi: सितम्बर (hi) m (sitambar)
- Hungarian: szeptember (hu)
- Hunsrik: September m
- Icelandic: september (is) m, septembermánuður m
- Ido: septembro (io)
- Inari Sami: čohčâmáánu
- Indonesian: september (id)
- Interlingua: septembre (ia)
- Inupiaq: Sikuaqtuġvik
- Irish: Meán Fómhair (ga) m
- Italian: settembre (it) m
- Jamaican Creole: Septemba
- Japanese: 九月 (ja) (くがつ, kugatsu), 長月 (ja) (ながつき, nagatsuki)
- Kabuverdianu: setenbru
- Kambera: wulang hiwa
- Kapampangan: pángasiam a búlan, septiembre, setiembre
- Kazakh: қыркүйек (kk) (qyrküiek)
- Khmer: កញ្ញា (km) (kaññaa)
- Kikuyu: Mũgaa Wa Keerĩ
- Korean: 구월(九月) (ko) (guwol)
- Kyrgyz: сентябрь (ky) (sentyabr)
- Ladin: setember
- Lakota: Čhaŋwápe ǧí wí
- Lao: ເດືອນກັນຍາ (dư̄an kan nyā)
- Latin: September (la)
- Latvian: septembris (lv) m
- Lezgi: мара (mara)
- Lithuanian: rugsėjis (lt) m, rugsėjo (lt) f
- Livonian: septembõr, sigžkū
- Low German:
- German Low German: September m, Harvstmaand m
- Luxembourgish: September (lb) m, Hierschtmount (lb) m
- Macedonian: септе́мври (mk) m (septémvri)
- Malagasy: septambra (mg)
- Malayalam: സെപ്റ്റംബർ (ml) (sepṟṟambaṟ)
- Maltese: Settembru (mt) m
- Manchu: ᡠᠶᡠᠨ
ᠪᡳ᠍ᠶᠠ (uyun biya)
- Mansi:
- Northern Mansi: сӯкыр э̄тпос (sūkyr è̄tpos), я̄ӈкпо̄льн э̄тпос (â̄ňkpōlʹn è̄tpos)
- Maori: Hepetema
- Mingrelian: ეკენია (eḳenia)
- Mirandese: Setembre m
- Mòcheno: leistagst m
- Mongolian:
- Cyrillic: есдүгээр сар (mn) (jesdügeer sar)
- Montagnais: ushkau-pishimᵘ
- Navajo: Biniʼantʼą́ą́tsoh
- Neapolitan: settiembre m, settembre m
- North Frisian:
- Föhr-Amrum: september m
- Mooring: harfstmoune m, septämber m
- Norwegian:
- Bokmål: september (no) m
- Nynorsk: september (nn) m
- Occitan: setembre (oc) m
- Odia: ସେପ୍ଟେମ୍ବର (sepṭembara)
- Ojibwe: waatebagaa-giizis
- Old Church Slavonic:
- Cyrillic: роуинъ m (ruinŭ)
- Old Czech: zářuj m
- Old Dutch: widomānoth
- Old English: hærfestmōnaþ m, hāliġmōnaþ m
- Oromo: Fulbaana
- Ossetian: сентябрь (sentjabrʹ)
- Pannonian Rusyn: септембер m (september)
- Pashto: ستمبر m (setámbr), سپتامبر m (septãmbár), سپتمبر (ps) m (septambár)
- Pennsylvania German: Sepdember
- Persian:
- Dari: سِپْتِمْبَر (siptimbar)
- Iranian Persian: سِپْتامْبْر (septâmbr)
- Plautdietsch: Septamba m
- Polish: wrzesień (pl) m inan
- Portuguese: setembro (pt) m
- Punjabi: ਸਤੰਬਰ (pa) m (satambar)
- Romanian: septembrie (ro), (popular) răpciune (ro), (popular) vinicer (ro)
- Romansch: satember m, settember m
- Russian: сентя́брь (ru) m (sentjábrʹ)
- Samoan: setema
- Sardinian: cabidanne, cabidanni, lundras, lùndaras
- Campidanese: cabudanni m
- Saterland Frisian: September
- Scots: September
- Serbo-Croatian:
- Cyrillic: септембар m
- Roman: septembar (sh) m, rujan (sh) m (Croatia)
- Shona: Gunyana
- Sicilian: sittèmmiru (scn) m
- Sinhalese: සැප්තැම්බර් (si) (sæptæmbar)
- Skolt Sami: čõhččmään
- Slovak: september (sk) m
- Slovene: septêmber (sl) m
- Sotho: Lwetse (st)
- Southern Altai: сентябрь (sentyabrʹ), оргок ай (orgok ay)
- Spanish: septiembre (es) m, setiembre (es) m (Costa Rica, Peru, Uruguay)
- Swahili: Septemba
- Swedish: september (sv) c
- Tahitian: tetepa
- Tajik: сентябр (tg) (sentyabr)
- Tatar: сентябрь (sentyabr’)
- Telugu: సెప్టెంబరు (sepṭembaru)
- Thai: กันยายน (th) (gan-yaa-yon)
- Tok Pisin: septemba
- Tongan: Sēpitema
- Turkish: eylül (tr), öğrüm (tr), verim ayı
- Turkmen: sentýabr
- Udmurt: куарусён (kuaruśon)
- Ukrainian: ве́ресень (uk) m (véresenʹ)
- Urdu: سِتَمْبَر (ur) m (sitambar)
- Uyghur: سېنتەبىر (sëntebir), سېنتەبر (sëntebr), توققۇزىنچى ئاي (toqquzinchi ay)
- Uzbek: sentyabr (uz)
- Vai: ꗻꔪꗳꕓ (Sɛpitɛ́mɓa)
- Venetan: setenbre (vec)
- Vietnamese: tháng chín (vi)
- Volapük: setul (vo)
- Võro: süküskuu
- Walloon: setimbe (wa)
- Welsh: Medi (cy) m
- West Frisian: septimber (fy), hjerstmoanne (fy)
- Winnebago: Hųųwą žuuk wiira
- Wolof: Sattumbar
- Yakut: Балаҕан ыйа (Balağan ıya)
- Yiddish: סעפּטעמבער (yi) m (september)
- Yup'ik: Amiraayaaq
- Zazaki: keşkelun (diq), êlule, rezan
- Zuni: Mola: Akwapba, Łi'dekwakkya Ts'ana
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