Phi o fi (Φ, φ) es la vigésima primera letra del alfabeto griego. Los romanos, al transliterar esta letra a caracteres latinos, lo hicieron con el dígrafo ph, con lo que representaron el sonido de p aspirada ([pʰ]) que tenía en griego antiguo: por ejemplo, en Phidias, philosophia o Pharao (en castellano: Fidias, filosofía, faraón). En griego moderno se pronuncia simplemente [f] como φέτα (feta queso). En el sistema de numeración griega tiene un valor de 500 (φʹ).

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Phi (uppercase Φ, lowercase File:Greek Phi normal.svg or File:Greek phi Didot.svg; Ancient Greek: ϕεῖ, pheî, [pʰé͜e]; modern Greek: φι, fi, [fi]; English: /faɪ/) is the 21st letter of the Greek alphabet. In Ancient Greek, it represented an aspirated voiceless bilabial plosive ([pʰ]), which was the origin of its usual romanization as "ph". In modern Greek, it represents a voiceless labiodental fricative ([f]) and is correspondingly romanized as "f". Its origin is uncertain but it may be that phi originated as the letter qoppa and initially represented the sound /kʷʰ/ before shifting to Classical Greek [pʰ]. In traditional Greek numerals, phi has a value of 500 (φʹ) or 500 000 (͵φ). The Cyrillic letter Ef (Ф, ф) descends from phi. Phi is also used as a symbol for the golden ratio and on other occasions in math and science. This use is separately encoded as the Unicode glyph ϕ. The modern Greek pronunciation of the letter is sometimes encountered in English (as /fiː/) when the letter is being used in this sense.

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