- Garrett High School
- Gary Lighthouse Charter School
- Gary Middle College
- Gateway Woods School
- George Rogers Clark Middle-High School
- George Washington High School
- Gibson Southern High School
- Goshen High School
- Grace Christian Academy Inc
- Granger Christian School
- Greencastle Senior High School
- Greenfield-Central High School
- Greensburg Community High School
- Greenwood Christian Academy
- Greenwood Community High School
- Griffith Senior High School
- Guerin Catholic High School
- Hagerstown Jr-Sr High School
- Hamilton Community High School
- Hamilton Heights High School
- Hamilton Southeastern High School
- Hammond Academy of Science & Technology
- Hammond High School
- Hanover Central High School
- Harwood Career Prep High School
- Hauser Jr-Sr High School
- Hebron High School
- Henryville Jr & Sr High School
- Heritage Christian School
- Heritage Hall Christian School
- Heritage Hills High School
- Heritage Jr/Sr High School
- Herron High School
- Highland High School
- Hobart High School
- Homestead Senior High School
- Hoosier Academy - Indianapolis
- Hope Academy
- Horizon Christian Academy
- Horizon Christian School
- Howe School
- Huntington North High School
- Impact Academy
- IN Academy for Science Math & Humanities
- Indian Creek Sr High School
- Indiana Academy
- Indiana Christian Academy
- Indiana Connections Academy
- Indiana Digital Alternative School
- Indiana Digital JR and High School
- Indiana Math & Science Academy North
- Indiana School For The Blind
- Indiana School For The Deaf
- Indiana Virtual School
- Indianapolis Lighthouse Charter School
- Indianapolis Lighthouse East
- Indianapolis Metropolitan High School
- Insight School of Indiana
- International School of Indiana
- Irvington Community School