元旦快乐英语翻译就是：Happy New Year。
元旦，即公历的1月1日，是世界多数国家通称的“新年”，所以元旦快乐就是新年快乐。
此外，用英语表达元旦快乐还可以参考以下的方式：
1、Good luck, good health, hood cheer. I wish you a happy New Year.
祝好运、健康、佳肴伴你度过一个快乐新年。
2、With best wishes for a happy New Year.
祝新年快乐，并致以良好的祝福。
3、I hope you have a most happy and prosperous New Year.
谨祝新年快乐幸福，大吉大利。
4、With the compliments of the season.
祝贺佳节。
5、May the season's joy fill you all the year round.
愿节日的愉快伴你一生。
6、Season's greetings and best wishes for the New Year.
祝福您，新年快乐。
7、Please accept my season's greetings.
请接受我节日的祝贺。
8、With very best wishes for your happiness in the New Year.
致以最良好的祝福，原你新年快乐幸福。
9、Please accept our wishes for you and yours for a happy New Year.
请接受我们对你及你全家的美好祝福，祝你们新年快乐。
10、May the coming New Year bring you joy, love and peace.
愿新年为你带来快乐，友爱和宁静。
11、Wishing you happiness during the holidays and throughout the New Year.
祝节日快乐，新年幸福。
12、A happy New Year to you.
恭贺新年。
茱莉亚罗伯杨
