Joliet Township High School District 204 (often shortened to JTHS) is a high school district located in Joliet in western Will County, Illinois.

Established in 1899 and founded in 1901, it is one of the area's oldest school districts.

JTHS's administrative center is located at the former headquarters for The Herald-News.

The district has been named a Chicago Tribune Top 100 Workplace for two years in a row.

In 2009 almost 53% of the district's students were classified as low income.