生日快乐的英文为：happy birthday。
当我们在祝福他人生日时也可用以下的英文短句：
1、Happy birthday. May gladness fill your every hour on this special day.
生日快乐！愿这特殊的日子里，你的每时每刻都充满欢乐。
2、Wishing you a happy birthday! May the best and loving things be some of the joy your birthday brings.
祝你生日快乐！愿生日带给你的欢乐中蕴涵着一切美好！
3、Wishing you glad days filled with friendliness, bright days filled with cheer, warm days filled with happiness to last throughout the year! Have a wonderful brithday！
愿你一年到头都有充满友谊的欢欣日子，充满愉快的明朗日子，充满幸福的温馨日子！祝你度过一个美妙的生日！
4、Hope your birthday is like you special. A Happy Birthday!
希望你的生日像你一样不同寻常。生日快乐！
5、Each birthday is a milestone we touch along life\s way. May your birthday be happy in more ways than one.
每个生日都是我们人生之旅的一个里程碑，愿你的生日百事顺意。
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