| PHD | Doctor of Philosophy 
| Others |
| PHD | P*ssy Hits Different
| Others |
| PHD | P*ssy Hyperactivity Disorder
| Others |
| PHD | P-Helicity Decoupling Scheme (P=Momentum)
| Others |
| PHD | Paint Has Dried
| Others |
| PHD | Paltry Hunka Dough
| Others |
| PHD | Partial Head Damage
| Others |
| PHD | Particularly Hard Dancing
| Others |
| PHD | Particularly High Deception
| Others |
| PHD | Passed High school with Difficulty
| Others |
| PHD | Passion Hunger and Discipline
| Others |
| PHD | Patented Hosel Design
| Others |
| PHD | Pathological Habit Disorder
| Others |
| PHD | Penitent Halo Disciple
| Others |
| PHD | People Hail Devil
| Others |
| PHD | Perfect Hair Day
| Others |
| PHD | Perfect Hair-Do
| Others |
| PHD | Perfect Hot Date
| Others |
| PHD | Perky Happy Disciple
| Others |
| PHD | Permanent Head Damage
| Others |
| PHD | Permanent Health Damage
| Others |
| PHD | Permanently Head Damaged
| Others |
| PHD | Persistently and Habitually Dumb
| Others |
| PHD | Personal Health Data
| Others |
| PHD | Personal Health Decision
| Others |
| PHD | Personal Health Diary
| Others |
| PHD | Personal Hygiene Disorder
| Others |
| PHD | Persons Having Dreams
| Others |
| PHD | Pete Hutchinson Design
| Others |
| PHD | Phage Host Defective
| Others |
| PHD | Philippino Historical Dialogue
| Others |
| PhD | Philosophiae Doctor
| Others |
| PHD | Physical Health Defined
| Others |
| PHD | Physical, Healthy, and Driven
| Others |
| PHD | Piled High and Deep
| Others |
| PHD | Piled Higher & Deeper
| Others |
| PHD | Piled Higher and Deeper
| Others |
| PHD | Piled Higher Deeper
| Others |
| PHD | Pillow Hurling Dexterity
| Others |
| PHD | Piston Heads
| Others |
| PHD | Pizza Home Delivery
| Others |
| PHD | Pizza Hut Delivery
| Others |
| PHD | Playa Hata's Degree
| Others |
| PHD | Playa Hatin Degree
| Others |
| PHD | Player Hating Degree
| Others |
| PHD | Please Help Doctor
| Others |
| PHD | Please Help Doctor!
| Others |
| PHD | Please Help Dying
| Others |
| PHD | Please Hire Desperate
| Others |
| PHD | Pleckstrin Homology Domain
| Others |
| PHD | Pocket Hard Disk
| Others |
| PHD | PolyHedra Database
| Others |
| PHD | Poor Helpless Drunk
| Others |
| PHD | Poor, Hungry, and Determined
| Others |
| PHD | Port Hueneme Division
| Others |
| PHD | Port Huron and Detroit Railroad (CSX Transportation)
| Others |
| PHD | Port Huron and Detroit Railroad Company
| Others |
| PHD | Portable Handheld Development
| Others |
| PHD | Portable Hard Disk
| Others |
| PHD | Portable Hard Drive
| Others |
| PHD | Positively Head Damaged
| Others |
| PHD | Post Hole Digger
| Others |
| PHD | Post Hole Digging
| Others |
| PhD | Post Homicidal Depression
| Others |
| PHD | Post-Hangover Drinking
| Others |
| PHD | Posts a Hundred times Daily
| Others |
| PHD | Posturing, Hallucinating, Dead
| Others |
| PHD | Potentially Harmful Drug
| Others |
| PHD | Potentially Headed for Divorce
| Others |
| PHD | Potentially Heavy Drinker
| Others |
| PHD | Pour House Dallas
| Others |
| PHD | Power House Dance
| Others |
| PHD | Power Hungry Dog
| Others |
| PhD | Prat of the highest Degree
| Others |
| PHD | Pre Home Dip
| Others |
| PHD | Pre-Historic Dinosaur
| Others |
| PHD | Preach Hellfire and Damnation
| Others |
| PHD | Premium Hot Dog
| Others |
| PHD | Preparation H Distributor
| Others |
| PHD | Preparing His Disciples
| Others |
| PHD | Presbyterian Hospital of Dallas
| Others |
| PHD | Presbyterian Hospital Of Dallasphd
| Others |
| PHD | Press Here, Dummy
| Others |
| PHD | Pretty Hair Doctor
| Others |
| PHD | Pretty Handsome Darling
| Others |
| PHD | Pretty Handsome Domestic
| Others |
| PHD | Pretty Handsome Dude
| Others |
| PHD | Pretty Happy Dog
| Others |
| PHD | Pretty Hard Drinking
| Others |
| PHD | Pretty Hard To Do
| Others |
| PHD | Pretty Heavy Dictionary
| Others |
| PHD | Pretty Heavy Drinker
| Others |
| PHD | Pretty Heavy Dude
| Others |
| PHD | Pretty High Dude
| Others |
| PHD | Pretty Hokey Dialogue
| Others |
| PHD | Pretty Holy Disciple
| Others |
| PHD | Pretty Huge Deal
| Others |
| PHD | Prison of Hopelessness and Dispair
| Others |
| PHD | Probably Half Demented
| Others |
| PHD | Procedures Help Desk
| Others |
| PHD | Process Historian Database
| Others |
| PHD | Professional Hair Dresser
| Others |
| PHD | Professional Hardware Diagnostics
| Others |
| PHD | Professional Help Desk
| Others |
| PHD | Professional Home Doctor
| Others |
| PHD | Professionals Hu Dare
| Others |
| PHD | Professor of Harmony Development
| Others |
| PHD | Programs For Human Development
| Others |
| PHD | Progress, Harmony, and Development
| Others |
| PHD | Project Half Done
| Others |
| PHD | Prolyl Hydroxylase Domain
| Others |
| PHD | Promotion in Human Devolopment
| Others |
| PHD | Proper Husband Discovery
| Others |
| PHD | Propitous Homely Dude
| Others |
| PHD | Psycotic, Hyped, Delusional
| Others |
| PHD | Public Health Department
| Others |
| PHD | Public Highway Distance
| Others |
| PHD | Publicly Horrific Display
| Others |
| PHD | Pulmonary Heart Disease
| Others |
| PHD | Pup Has Discipline
| Others |
| PHD | Pure Hard Dance
| Others |
| PHD | Purveyor of Hyped Drivel
| Others |
| PHD | Push Here, Dummy
| Others |