Happy birthday! It is one of the most important phrases for celebration. Everybody definitely says this phrase when they are invited to a birthday party. It is totally okay to say Happy Birthday in English to Japanese people because they are familiar with the phrase. But there are some Japanese happy birthday phrases that are good for certain situations and relationships. So let’s learn about them and have a great celebration with your friends! Casual Way of Saying Happy Birthday お誕生日おめでとう！ お誕生日おめでとう！/otanjoubi-omedetou!/ This is the most common phrase for celebrating with family and friends. お誕生日(otanjoubi) means a birthday. おめでとう(omedetou) is ...