European languages
Albanian: Gëzuar Krishtlindja
Aragonese: Feliz nadal
Armenian: շնորհավոր Սուրբ Ծնունդ (šnorhavor Surb Cnund)
Asturian: Feliz navidá
Azerbaijani: Xoşbəxt milad
Basque: Eguberri on
Belarusian: з Калядаамі (z Kaljadámi), з Нараджэннем (z Naradžénnjem), з Нараджэннем Хрыстовым (z Naradžénnjem Xrystóvym)
Bosnian: Srećan Božić, Sretan Božić
Breton: Nedeleg laouen
Bulgarian: Весела Коледа (Vesela Koleda)
Catalan: Bon Nadal
Cornish: Nadelik Lowen
Corsican: Bon Natale è pace è salute
Croatian: Sretan Božić
Czech: Veselé Vánoce
Danish: glædelig jul, god jul
Dutch: Vrolijk kerstfeest, prettig kerstfeest, Zalig KerstfeestEnglish: Merry Christmas, Happy ChristmasEsperanto: Äœojan Kristnaskon
Estonian: Häid jõule
Faroese: Gleðilig jól
Finnish: Hyvää joulua, Hauskaa joulua
French: Joyeux Noël
Frisian (West): Noflike krystdagen
Galician: Bo Nadal
Georgian: შობას გილოცავთ (šobas gilocavt)
German: Frohe Weihnachten, Fröhliche Weihnachten
Greek: Καλά Χριστούγεννα (kalá Christoúgenna)
Greenlandic: Juullimi pilluarit, Juullisiorluarit
Hungarian: Boldog karácsonyt
Icelandic: Gleðileg jól
Irish: Nollaig Shona
Italian: Buon Natale
Latin: Felix dies Nativitatis, Natale Hilare
Latvian: Priecīgus Ziemassvētkus
Lithuanian: Linksmų Kalėdų
Luxembourgish: Schéine Chrëschtdag
Macedonian: Среќен Божиќ (Sreḱen Božiḱ), Христос се роди (Hristos se rodi), Навистина се роди (Navistina se rodi) (reply to “Hristos se rodi”)
Maltese: il-Milied it-Tajjeb
Moksha: Роштува мархта (Roštuva marxta)
Norman: Un bouan Noué (Jersey)
Norwegian: god jul
Occitan: Bon Nadal
Polish: Wesołych Świąt, Wesołych Świąt Bożego Narodzenia
Portuguese: Feliz Natal
Romanian: Crăciun fericit
Russian: с Рождеством (s Roždestvóm), с Рождеством Христовым (s Roždestvóm Xristóvym), Весёлого Рождестваа (Vesjólovo Roždestvá), Счастливого Рождестваа (Sčastlívovo Roždestvá)
Sami (Lule): Buorre javla
Sami (Northern): Buorit juovllat
Sami (Southern): Buerie jåvle
Sardinian: Bona Pasca de Nadale
Scottish Gaelic: Nollaig Chridheil
Serbian: Срећан Божић (Srećan Božić), Сретан Божић (Sretan Božić), Христос се роди (Hristos se rodi), Ваистину се роди Vaistinu se rodi (reply to “Hristos se rodi”)
Silesian: Radosnych Godōw
Slovak: Veselé Vianoce
Slovene: Vesel božič
Sorbian (Lower): Wjasołe gódy
Sorbian (Upper): Wjesołe hody
Spanish: feliz Navidad
Swedish: God jul
Turkish: Mutlu Noeller
Ukrainian: з Різдвом (z Rizdvóm), з Різдвом Христовим (z Rizdvóm Xrystóvym)
Welsh: Nadolig Llawen
Yiddish: אַ פֿריילעכן ניטל‎ (a freylekhn nitl)
Asian languages
Arabic: عِيد مِيلَاد مَجِيد‎ (ʿīd mīlād majīd), مِيلَاد مَجِيد‎ (mīlād majīd)
Armenian: շնորհավոր Սուրբ Ծնունդ (šnorhavor Surb Cnund)
Azerbaijani: xoşbəxt milad
Burmese: Hnit thit ku mingalar pa
Cebuano: Malipayong pasko
Chinese (Mandarin): 聖誕快樂, 圣诞快乐 (Shèngdàn kuàilè), 聖誕節快樂, 圣诞节快乐 (Shèngdànjié kuàilè)
Georgian: შობას გილოცავთ (šobas gilocavt)
French: Joyeux Noël
Hebrew: חג מולד שמח‎ (khag molad sameakh)
Hindi: शुभ बड़ा दिन (śubh baṛā din), शुभ क्रिस्मस (śubh krismas), मेरी क्रिसमस (merī krismas), क्रिसमस मुबारक (krismas mubārak)
Indonesian: selamat hari Natal, selamat Natal
Japanese: メリークリスマス (Meri Kurisumasu)
Javanese: Sugeng Natal
Jingpho: Ngwi pyaw ai X’mas rai u ga
Karo Batak: Selamat wari Natal
Kazakh: рождество құтты болсын (rojdestvo quttı bolsın)
Khmer: រីករាយថ្ងៃបុណ្យណូអែល (riikriəythngaybonyɔɔnouʾael), បុណ្យ​ណូអែល (bon-nouʾael)
Korean: 즐거운 성탄절 (jeulgeoun seongtanjeol), 메리 크리스마스 (meri keuriseumaseu)
Kyrgyz: Жаратканнын туысымен (Caratkannın tuısımen)
Lao: ສຸກສັນວັນຄຣິດສມາດ (suk san wan kha rit sa māt)
Malay: Selamat hari Natal, selamat Natal
Mongolian: Зул сарын мэнд хүргэе (Zul saryn mend hürgeje)
Persian: میلاد مسیح مبارک باد‎ (milâd-e masih mobârak bâd), کریسمس مبارک‎ (kerismas mobârak)
Sinhalese: සුභ නත්තලක් (subha nattalak)
Sundanese: Wilujeng Natal
Tagalog: Maligayang pasko
Tajik: Мавлуди Исо муборак (mavludi Iso muborak)
Tamil: கிறிஸ்துமஸ் நல்வாழ்த்துக்கள் (kiṟistumas nalvāḻttukkaḷ)
Telugu: మెర్రీ క్రిస్మస్ (merrī krismas)
Thai: สุขสันต์วันคริสต์มาส (sùk-sǎn wan krís-mâas)
Turkish: Mutlu Noeller
Urdu: کرسمس مبارک‎ (krismas mubārak), میری کرسمس‎ (merī krismas), شبھ کرسمس‎ (shubh krismas), شبھ بڑا دن‎ (shubh baṛā din)
Uzbek: Rojdestvo muborak
Vietnamese: Chúc mừng Giáng sinh, Chúc mừng Nô-en, Chức mừng Giáng sinh, Chức mừng Nô-en
African languages
Afrikaans: Geseënde kersfees
Akan: Afishapa
Amharic: መልካም ገና (mälkam gäna)
Arabic: عِيد مِيلَاد مَجِيد‎ (ʿīd mīlād majīd), مِيلَاد مَجِيد‎ (mīlād majīd)
Chichewa: khrisimasi yabwino
English: Merry Christmas, Happy Christmas
Ewe: Blunya na wo
French: Joyeux Noël
Portuguese: Feliz Natal
Swahili: Heri ya Krismasi, Krismasi njema
Zulu: uKhisimusi oMuhle
American languages
Alutiiq: Nunaniqsaakici AÊ€usistuami
Aymara: Sooma nawira-ra
Cherokee: ᎤᏬᏢᏗ ᏓᏂᏍᏓᏲᎯᎲ (uwotlvdi danisdayohihv)
English: Merry Christmas
Greenlandic: Juullimi pilluarit, juullisiorluarit
Haitian Creole: Jwaye Nowèl
Hawaiian: Mele Kalikimaka
Lushootsee😨 Haʔɬ pədx̌aʔx̌aʔ
Navajo: Yáʼátʼééh Késhmish, Nizhónígo Késhmish Adííłeeł
Papiamentu: Bon Pascu
Portuguese: Feliz Natal
Spanish: Feliz Navidad
Yup’ik: Alussistuaqegtaarmek piamken, Alussistuaqegcikici (plural subject, plural object)
Languages of Oceania
English: Merry Christmas, Happy Christmas
Samoan: Manuia le Kerisimasi

Source No. 1.


Source No. 2.