PHD

PHD, with variations in capitalization and punctuation, is a three letter acronym that may refer to:

• Ph.D., the academic degree of Doctor of Philosophy
• Ph.D. (band), a 1980s British group
• PHD finger, a protein sequence
• PHD Mountain Software, an outdoor clothing and equipment company
• PhD Docbook renderer, an XML renderer
• PhD: Phantasy Degree, a Korean comic series
• PHD, an Italian pizza shop based in Hong Kong
• Phospholipid
• Piled Higher and Deeper, a web comic
• Parisada Hindu Dharma, an Indonesian reform organization
• Pisarenko harmonic decomposition, a method of frequency estimation
• Prolyl hydroxylase, an enzyme
• "PHD", a song by the Crystal Method from Tweekend
• Post hole digger