PYD may refer to:
- "PYD" (song), 2013 single by Justin Bieber featuring R. Kelly, part of Justin Bieber's series of weekly Music Mondays releases
- Democratic Union Party (Syria), a Kurdish Syrian political party, abbreviated as PYD, based on its Kurdish official name Partiya Yekîtiya Demokrat
- Pyrin domain, or the protein domain, abbreviated as PYD
- Abbreviation of Positive youth development
"PYD" is a single by Canadian recording artist Justin Bieber featuring American singer-songwriter and record producer R. Kelly. It was released on November 18, 2013; the acronym stands for "Put You Down". The song is the seventh in Bieber's series Music Mondays, the first six being " Heartbreaker" (October 7, 2013), " All That Matters" (October 14), " Hold Tight" (October 21), " Recovery" (October 28), " Bad Day" (November 4), and " All Bad" (November 11). Bieber released a new single every week for 10 weeks from October 7 to December 9, 2013.