P
- Palko v. Connecticut302 U.S. 319 (1937)
- Parents Involved In Community Schools v. Seattle School District127 S.Ct. 2738 (2007)
- Penn Central Transportation Co. v. New York City438 U.S. 104 (1978)
- Pierce v. Society Of Sisters268 U.S. 510 (1925)
- Planned Parenthood Of Southeastern Pennsylvania v. Casey505 U.S. 833 (1992)
- Plessy v. Ferguson163 U.S. 537 (1896)
- Plyler v. Doe457 U.S. 202 (1982)
- Poe v. Ullman367 U.S. 497 (1961)