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. (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
 
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