PHD
PHD or PhD may refer to:

Doctor of Philosophy (PhD), an academic qualification

Entertainment
PhD: Phantasy Degree, a Korean comic series
Piled Higher and Deeper, a web comic
Ph.D. (band), a 1980s British group
Ph.D. (Ph.D. album)
Ph.D. (Art Farmer album)
"PHD", a song on the album Tweekend by the Crystal Method

Science and technology
PHD finger, a protein sequence
Enzymes  PHD1,  PHD2 and  PHD3

Locations
Naval Surface Warfare Center, Port Hueneme Division, Port Hueneme, California
Harry Clever Field, a small, public general aviation airport in New Philadelphia, Ohio