The Mid-Autumn Festival, a time-honored tradition celebrated primarily in China and other East Asian countries, is a joyous occasion filled with family reunions, mooncakes, and the beauty of the full moon. If you want to wish someone a happy Mid-Autumn Festival in English, here are some heartfelt expressions you can use:

1. "Happy Mid-Autumn Festival!"

2. "Wishing you a joyful Mid-Autumn Festival filled with love and harmony."

3. "May this Mid-Autumn Festival bring you happiness and prosperity."

4. "Enjoy the sweetness of the mooncakes and the warmth of family during this Mid-Autumn Festival."

5. "Warm wishes on the occasion of the Mid-Autumn Festival!"

These phrases not only convey your good wishes but also capture the essence of the festival's spirit. Whether you're sending a message to a friend or expressing your sentiments on social media, these greetings will surely resonate and make the recipient feel special.

Remember, the Mid-Autumn Festival is about togetherness and gratitude, so adding a personal touch to your message can make it even more meaningful.