- Abaza: декабрь (dekabrʲ)
- Abkhaz: ԥхынҷкәын (pxənčʼkʷʼən)
- Adyghe: Тыгъэгъаз (Təğeğaaz)
- Afrikaans: Desember (af)
- Alabama: hasiholtina istapókkòolawah tóklo, hasiholtina istanóoka
- Albanian: dhjetor (sq) m
- Alemannic German: Dezember m
- Aleut: dikaabrax̂
- Alutiiq: Qanim Iralua
- Amharic: ዲሴምበር (disembär)
- Apache:
- Western Apache: Zas Nłtʼees
- Arabic: دِيسِمْبِر (ar) m (disimbir), دِيسَمْبِر (ar) m (disambir), كَانُون الْأَوَّل m (kānūn al-ʔawwal)
- Aragonese: abiento (an) m
- Armenian: դեկտեմբեր (hy) (dektember)
- Old Armenian: դեկտեմբեր (dektember)
- Aromanian: andreu (roa-rup), dechemvriu
- Assyrian Neo-Aramaic: ܟܵܢܘܿܢ ܩܲܕ݇ܡܵܝܵܐ m (kanon qāmaya)
- Asturian: avientu (ast) m, diciembre (ast)
- Atikamekw: Pitcipipon pisimw
- Azerbaijani: dekabr (az)
- Basque: abendu (eu)
- Belarusian: сне́жань (be) m (snjéžanʹ), (Taraškievica) сьне́жань m (sʹnjéžanʹ)
- Bengali: ডিসেম্বর (bn) (ḍisembor)
- Bikol Central: Desyembre (bcl)
- Bislama: desemba
- Breton: Kerzu (br), miz Kerzu
- Bulgarian: деке́мври (bg) m (dekémvri)
- Burmese: ဒီဇင်ဘာ (my) (dijangbha), ဆယ့်နှစ်လ (hcai.hnacla.)
- Catalan: desembre (ca) m
- Central Dusun: Momuhau
- Chechen: Гӏуран-бутт (Ğuran-butt)
- Cherokee: ᎥᏍᎩᏱ (vsgiyi)
- Chichewa: Disembala
- Chinese:
- Cantonese: 十二月 (sap6 ji6 jyut6)
- Dungan: лайүә (layüə), шыэрйүә (šɨeryüə)
- Hakka: 十二月 (sṳ̍p-ngi-ngie̍t)
- Mandarin: 十二月 (zh) (shí'èryuè)
- Min Nan: 十二月 (cha̍p-jī-go̍eh, cha̍p-jī-ge̍h, cha̍p-jī-gōe, cha̍p-lī-go̍eh, cha̍p-lī-ge̍h, cha̍p-lī-gōe)
- Chukchi: атъылёкэ (atʺyljokė), атъыԓёкэ (atʺyḷjokė), ӄууԓьетйъиԓгын (quuḷʹetjʺiḷgyn)
- Chuvash: раштав (raštav)
- Coptic: ⲇⲉⲕⲉⲙⲃⲣⲓⲟⲥ (dekembrios)
- Corsican: dicembre (co) m, dicembri (co) m
- Czech: prosinec (cs) m
- Dakota: Wiiakenoŋpa
- Danish: december (da) c
- Dhivehi: ޑިސެމްބަރު (dv) (ḍisem̊baru)
- Dutch: december (nl) m
- Dzongkha: སྤྱི་ཟླ་བཅུ་གཉིས་པ། (spyi zla bcu gnyis pa)
- Erzya: ацамков (acamkov)
- Esperanto: decembro (eo), Decembro
- Estonian: detsember (et)
- Ewe: Dzome, Dezember
- Faroese: desember m, desembur m
- Fijian: Tiseba
- Finnish: joulukuu (fi)
- Franco-Provençal: dècembro
- French: décembre (fr) m
- Friulian: Dicembar m, Disembar m
- Galician: decembro (gl) m, nadal (gl) m
- Georgian: დეკემბერი (ka) (deḳemberi)
- German: Dezember (de) m, Julmond (de) m
- Gilbertese: Ritembwa
- Greek: Δεκέμβριος (el) m (Dekémvrios), Δεκέμβρης (el) m (Dekémvris)
- Greenlandic: decembari
- Haitian Creole: desanm
- Hausa: Disamba (ha)
- Hawaiian: Kēkēmapa
- Hebrew: דצמבר \ דֶּצֶמְבֶּר (he) m (detsémber)
- Hindi: दिसम्बर (hi) m (disambar)
- Hungarian: december (hu)
- Icelandic: desember (is) m, desembermánuður m
- Ido: decembro (io)
- Indonesian: Desember (id)
- Interlingua: decembre (ia)
- Inuktitut: ᑎᓯᒻᐳᕆ (iu) (tisimpori)
- Inupiaq: Uyaliġvik, Siqiñġiḷaq
- Irish: Mí na Nollag m
- Italian: dicembre (it) m
- Japanese: 十二月 (ja) (じゅうにがつ, jū ni gatsu), 師走 (ja) (しわす, shiwasu)
- Kabuverdianu: Dezembru (Badiu), D'zembr' (São Vicente), dizenbru
- Kambera: wulang hakambulu dàmbu
- Kapampangan: kalabin-aduang búlan, Désiembiri
- Kazakh: желтоқсан (kk) (jeltoqsan)
- Khmer: ធ្នូ (km) (thnuu)
- Kikuyu: Gatumu
- Kongo: desembele
- Korean: 십이월 (ko) (sibiwol)
- Kyrgyz: декабрь (ky) (dekabrʹ)
- Ladin: dezember
- Lakota: Tȟahékapšuŋ wí, Waníčhoka wí
- Lao: ເດືອນທັນວາ (dư̄an than wā)
- Latin: december (la)
- Latvian: decembris m
- Lezgi: фандукӏ (fanduḳ)
- Limburgish: December m
- Lingala: dɛsɛ́mbɛ
- Lithuanian: gruodis (lt) m
- Livonian: detsembõr
- Low German:
- Dutch Low Saxon: december
- German Low German: Dezember m, Juulmaand m
- Luxembourgish: Dezember (lb) m, Chrëschtmount (lb) m
- Maasai: ɨn-tʉŋʉ́s
- Macedonian: деке́мври (mk) m (dekémvri)
- Malay: Disember (ms)
- Malayalam: ഡിസംബർ (ml) (ḍisambaṟ)
- Maltese: Diċembru (mt) m
- Manchu: (please verify) ᠵᠣᡵᡤᠣᠨ
ᠪᡳᠶᠠ (jorgon biya)
- Maori: Tīhema
- Marathi: डिसेंबर (ḍisembar)
- Mingrelian: ქირსეთუთა (kirsetuta)
- Mirandese: Dezembre m
- Mongolian: арван хоёрдугаар сар (arvan xojordugaar sar)
- Montagnais: pishimuss
- Mòcheno: schantònderer m
- Navajo: Níłchʼitsoh
- Neapolitan: deciémbro, dicèmbre
- North Frisian:
- Föhr-Amrum: deetsember m
- Mooring: jülmoune m, detsämber m
- Northern Sotho: Manthole
- Norwegian:
- Bokmål: desember (no) m
- Nynorsk: desember (nn) m
- Occitan: decembre (oc) m
- Ojibwe: manidoo-giizisoons
- Old Church Slavonic: Дєкємбрїй m (Dekembrij)
- Old English: ǣrra ġēola m, December
- Oriya: ଡିସେମ୍ବର (ḍisembôrô)
- Oromo: Muddee (om)
- Ossetian: декабрь (dekabrʹ)
- Pashto: سامبر m (disãmbar), دسمبر m (desambar)
- Pennsylvania German: Dezember, Grischtmonet, Grischtmunet
- Persian: دسامبر (fa) (desâmbr)
- Punjabi: ਦਸੰਬਰ m (dasambar)
- Plautdietsch: Dezamba m
- Polabian: ardĕmond m
- Polish: grudzień (pl) m inan
- Portuguese: dezembro (pt) m
- Romagnol: dizèmbar m, dezémbar m
- Romanian: decembrie (ro), (pop) undrea (ro)
- Romansch: december m, dezember m, schember m
- Russian: дека́брь (ru) m (dekábrʹ)
- Samoan: tesema
- Sardinian:
- Campidanese: nadali m, nadabi, (please verify) mesi de paschixèdda m
- Logudorese: nadàle m, (please verify) mese de ’idas m, meseidas
- Saterland Frisian: Dezember
- Scots: December
- Scottish Gaelic: Dùbhlachd (gd) f
- Serbo-Croatian:
- Cyrillic: дѐце̄мбар m, про̀синац m (Croatia)
- Roman: dècēmbar m, pròsinac (sh) m (Croatia)
- Shona: Zvita
- Sicilian: dicèmmiru (scn) m, decèmmiru (scn) m, dicembri (scn) m
- Sinhalese: දෙසැම්බර් (desæmbar)
- Skolt Sami: rosttovmään
- Slovak: december (sk) m
- Slovene: decêmber (sl) m
- Sotho: Tshitwe (st)
- Spanish: diciembre (es) m
- Swazi: íNgongóni (ss)
- Swedish: december (sv) c
- Tagalog: Disyembre (tl)
- Tahitian: tītema
- Tajik: декабр (tg) (dekabr)
- Tamil: டிசம்பர் (ṭicampar)
- Tatar: декабрь (dekabr’)
- Telugu: డిసెంబరు (ḍisembaru)
- Thai: ธันวาคม (th) (tan-waa-kom)
- Tok Pisin: disemba
- Tongan: Tisema
- Turkish: aralık (tr), kânunuevvel (tr) (archaic), yeldoksan
- Turkmen: dekabr
- Udmurt: толсур (tolsur)
- Ukrainian: гру́день (uk) m (hrúdenʹ)
- Urdu: دسمبر (ur) m (disambar)
- Uyghur: دېكابىر (dëkabir), دېكابر (dëkabr), ئون ئىككىنچى ئاي (on ikkinchi ay)
- Uzbek: dekabr (uz)
- Venetian: disenbre (vec)
- Veps: tal'vku
- Vietnamese: tháng Mười hai (vi), tháng Mười Hai (vi), tháng mười hai (vi)
- Volapük: dekul (vo)
- Võro: joulukuu
- Walloon: decimbe (wa)
- Welsh: Rhagfyr (cy) m
- West Frisian: desimber (fy), wintermoanne (fy)
- Winnebago: Caa hee wakšų wiira
- Wolof: Disembar
- Yakut: Ахсынньы (Aqsınnyı)
- Yiddish: דעצעמבער (yi) m (detsember)
- Yup'ik: Uivik
- Zazaki: Gağan (diq), Gağane, Kanun
- Zuni: Ik'ohbu Yachunne
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