Thomas Jefferson High School (commonly referred to as Jefferson High School, Rockford Jefferson, or JHS) is a public coed four-year high school, in Rockford, Illinois, United States.

The school is named after the third President of the United States, Thomas Jefferson.

The official school colors are red, white, and gold.

[10] Jefferson High School is a member of the Northern Illinois Conference (NIC-10) and participates in state championship tournaments sanctioned by the Illinois High School Association (IHSA).

[11] The following competitive teams won their respective IHSA sanctioned state championship tournament: The following competitive teams won their respective IHSA sanctioned state championship tournament: