| PISD | Paradise Independent School District 
| Others |
| PISD | Partnership for Integrity in Scientific Dis
| Others |
| PISD | Pasadena Independent School District
| Others |
| PISD | Pearland Independent School District
| Others |
| PISD | Pflugerville Independent School District
| Others |
| PISD | Piezo Electric Ignition and Sensing Device
| Others |
| PISD | Plano Independent School District
| Others |
| PISD | Plano ISD
| Others |
| PISD | Pleasanton Independent School District
| Others |
| PISD | Post Infidelity Stress Disorder
| Others |
| PISD | Post Irradiation Sudden Deafness
| Others |
| PISD | Prosper Independent School District
| Others |
| PISD | Rosa and Raymond Parks Institute for Self-Development
| Others |