- Illinois ex rel. McCollum v. Board of Education
- Illinois v. Gates
- Illinois v. Lafayette
- Illinois v. Perkins
- Illinois v. Rodriguez
- Immigrants' Rights
- Immigration and Naturalization Service v. Chadha
- In Re Baby Girl Clausen
- In Re Debs
- In re Gault
- In re Marriage of Buzzanca
- In re Neagle
- In re Primus
- In re Winship
- In the Matter of Baby M
- In the Matter of Quinlan
- Ingraham et al. v. Wright et al.
- International Shoe Co. v. State of Washington
- International Society for Krishna Consciousness v. Lee
- The Internet
- Island Trees Union Free School District Board of Education v. Pico
