QD may refer to:
Qdoba Mexican Eats ( kew-DOH-bə), is a chain of fast casual restaurants in the United States and Canada serving Mexican-style cuisine.
Qdos Entertainment is one of the largest entertainment groups in Europe. Formed by Nick Thomas in 1999, it currently employs 1300 full-time staff across its businesses.
QDPR (quinoid dihydropteridine reductase) is a human gene that produces the enzyme quinoid dihydropteridine reductase.
Qdeir is a prehistoric, Neolithic Tell and plateau in the El Kowm oasis, a 20 km (12 mi) gap in the Syrian mountains that houses a series of archaeological sites.
QDT is a production supergroup, featuring DJ Quik, Snoop Dogg and Teddy Riley. QDT stands for Quik-Dogg-Teddy.
Quantum dots (QD) are very small semiconductor particles, only several nanometres in size, so small that their optical and electronic properties differ from those of larger particles.