PAS can stand for...

• Islamic Party of Malaysia (Parti Islam SeMalaysia), a Malaysian political party
• Periodic acid-Shiff reaction, a staining method for carbohydrates in light microscopy
• Para-amino salicylic acid , an old treatment for tuberculosis
• Xiaolingtong, a Chinese wireless telephone standard also known as Personal Access Standard.
• Parental alienation syndrome
• Physician-assisted suicide
• Percussive Arts Society
• Polish Academy of Sciences
• Pump action shotgun
• PepsiAmericas