Arabic - "I'd Miilad Said Oua Sana Saida"
Argentine - "Felices Pasquas Y felices ano Nuevo"
Armenian - "Shenoraavor Nor Dari yev Pari Gaghand"
Basque - Eguberri on
Bohemian - "Vesele Vanoce"
Breton - "Nedeleg laouen na bloavezh mat"
Bulgarian - "Tchestita Koleda; Tchestito Rojdestvo Hristovo"
Chinese - [Mandarin] - "Kung His Hsin Nien bing Chu Shen Tan"
Chinese - [Catonese] - "Saint Dan Fai Lok"
Cornish - "Nadelik looan na looan blethen noweth"
Croatian - "Sretan Bozic i Nova Godina" (Merry Christmas & Happy New Year)
Czech - "Prejeme Vam Vesele Vanoce a stastny Novy Rok"
Danish - "Glædelig Jul"
Dutch - "Vrolijk Kerstfeest en een Gelukkig Nieuwjaar"
Inupiaq Eskimo (Kotzebue area in NW Alaska)-
Quvianagli Anaiyyuniqpaliqsi suli Nakuuluni Ukiutqiutiqsi-
(Merry Christmas) (and) (Happy New Year)
English - "Merry Christmas"
Estonian - "Haid joule ja head uut aastat"
Farsi - "Cristmas-e-shoma mobarak bashad"
Filipino-"Maligayang Pasko"
Happy New Year in Filipino
"Manigong Bagong Taon"
Merry Christmas and a Happy New Year in Filipino- "Maligayang Pasko at Manigong Bagong Taon"
Finnish - "Hyvaa joulua"
French - "Joyeux Noël"
German - "Froehliche Weihnachten"
Greek - "Kala Christouyenna"
Hawaiian - "Mele Kalikimaka"
Hebrew - "Mo'adim Lesimkha. Chena tova"
Hindi - "Shub Naya Baras"
Hungarian - "Kellemes Karacsonyi unnepeket"
Icelandic - "Gledileg Jol"
Indonesian - "Selamat Hari Natal"
Iraqi - "Idah Saidan Wa Sanah Jadidah"
Irish - "Nollaig Shona Dhuit"
Italian - "Buone Feste Natalizie"
Japanese -" Shinnen omedeto, kurisumasu omedeto.
The first part is translated "Happy New Year.
Kurisumasu omedeto means Merry Christmas.
Japanese people generally add the expression gozaimasu to indicate soemm humility.
Korean - "Sung Tan Chuk Ha"
Latvian - "Prieci'gus Ziemsve'tkus un Laimi'gu Jauno Gadu"
Lithuanian - "Linksmu Kaledu"
Navajo - "Merry Keshmish"
Norwegian - "God Jul"
Pennsylvania German - "En frehlicher Grischtdaag un en hallich Nei Yaahr"
Polish - "Wesolych Swiat Bozego Narodzenia"
Portuguese - "Feliz Natal" "Boas Festas"(Good Holidays.)
Rumanian - "Sarbatori Fericite"
Russian - "Pozdrevlyayu s prazdnikom Rozhdestva s Novim Godom"
Serbian - "Hristos se rodi"
Slovakian - "Sretan Bozic or Vesele vianoce"
Samoan - "La Maunia Le Kilisimasi Ma Le Tausaga Fou"
Scots Gaelic - "Nollaig chridheil huibh"
Serb-Croatian - "Sretam Bozic. Vesela Nova Godina"
Slovak - "Vesele Vianoce. A stastlivy Novy Rok"
Slovene - "Vesele Bozicne. Screcno Novo Leto"
Spanish - "Feliz Navidad"
Swedish - "God Jul and (Och) Ett Gott Nytt År"
Tahitian -Merry Chrismas :" Ia orana te Noera"
and Happy new year is "Ia orana i te mata iti api"
Thai - "Sawadee Pee Mai"
Turkish - "Noeliniz Ve Yeni Yiliniz Kutlu Olsun"
Ukrainian - "Z Rizdvom Khrystovym !" - "Merry Christmas"
" Z Novym Rokom !" - "Happy New Year"
"Z Rizdvom Khrystovym i Novym Rokom !" - both greetings together.
Vietnamese - "Chuc Mung Giang Sinh"
Welsh - "Nadolig Llawen"
Yugoslavian - "Cestitamo Bozic"
(with thanks to William Serchak)