《Happy Birthday》的歌詞如下：
Happy birthday to you
祝你生日快樂
Happy birthday to you
祝你生日快樂
Happy day for you
快樂的日子屬於你
Happy day for you
快樂的日子屬於你
With a song for your birthday
慶祝你生日的歌聲
And best wishes from your friend
友人的最好祝福
For you, one and all
為了你，所有人都會這樣做
Hoping you have a grand time
希望你能盡情歡樂
When it's your time to shine
當你的時刻來臨的時候
Your birthday wish, we'll renew
你的生日祝願，我們會重新許願
Happy birthday to you
祝你生日快樂
副歌：
So gather 'round friends and family
所以朋友和家人都聚在一起吧
And join in the fun of today's affair
加入到今天的慶祝活動中來吧
For all that glitters and sparkles and shines
因為所有閃耀、發光和閃爍的東西
Will make your birthday dreams come true
都會讓你的生日夢想成真
Happy birthday to you
祝你生日快樂
重複副歌部分。