13+ Happy Birthday Capitalization. Happy birthday is typically capitalized in a sentence because it is a proper noun phrase used as a title or greeting to mark a special occasion. The expression is used in pattern practice, short diaglogs, songs etc.

What are the rules of capitalization for “happy birthday”? When writing happy birthday in a greeting card or invitation, it is essential to follow the capitalization rules of the context. (“happy birthday!” is what people usually say when they’re talking to the birthday person.)







