PHD or PhD may refer to:

• Doctor of Philosophy (PhD), an academic qualification

• PhD: Phantasy Degree, a Korean comic series
• Piled Higher and Deeper or PhD Comics, a webcomic

• 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

• PHD finger, a protein sequence
• Harry Clever Field (IATA and FAA LID: PHD), a US airport

• EGLN2 or PHD1, an enzyme
• EGLN1 or PHD2, an enzyme
• EGLN3 or PHD3, an enzyme
• Naval Surface Warfare Center Port Hueneme (NSWC PHD), California, US

This disambiguation page lists articles associated with the title PHD.
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