Do you have a German friend or family member who is having a birthday? Before learning how to say "Happy Birthday" in German though, you need to know about one important cultural point especially among older Germans: Wishing a German a happy birthday before their birthday is considered bad luck, so don't do it. And as for gifts and cards you may want to send, just make sure to state to them that they should open the package on their birthday.
Now for some birthday expressions:
(Please note that the following translations are the English equivalents and not literal translations.)