How do you say Happy New Year in Japanese? It's Akimashite Omedetto Gozaimasu. Cool huh? Here are more ways you can say Happy New Year in other languages:
Persian - Sal -e- no mobarak
Philippines - Manigong Bagong Taon!
Polish - Szczesliwego Nowego Roku
Portuguese - Feliz Ano Novo
Russian - S Novim Godom
Serbo-Croatian - Sretna nova godina
Slovak - Stastny Novy rok
Slovenian - sreèno novo leto
Thanks to this article on Happy New Year in different languages for these.