"Ko e fasi ʻo e tuʻi ʻo e ʻOtu Tonga" (pronounced [ko e fasi ʔo e tuʔi ʔo e ʔotu toŋa]; alternatively "Ko e fasi ʻo e kuini ʻo e ʻOtu Tonga" when the Tongan monarch is female) is the national anthem of Tonga.

The title literally means "song of the king of the Tonga Islands" or "song of the queen of the Tonga Islands" (when the monarch is female) in the Tongan language but is in daily life better known as "Fasi fakafonua", which translates to "National Song".

The lyrics of the anthem were written by Tongan Prince Uelingatoni Ngū Tupoumalohi, with the music by German-born New Zealand composer Carl Gustav Schmitt.

ʻE ʻOtua māfimafi Ko homau ʻeiki koe Ko koe ko e falalaʻanga Mo e ʻofa ki Tonga; ʻAfio hifo ʻemau lotu ʻAia ʻoku mau faí ni Mo ke tali homau loto ʻO maluʻi ʻa Tupou.

Oh almighty God above Thou art our lord and sure defense As your people, we trust thee And our Tonga thou dost love Hear our prayer for thou unseen We know that thou hast blessed our land Grant our earnest supplication Guard and save Tupou, our king (queen).