Round Lake High School, officially Round Lake Senior High School, and commonly RLHS, is a public four-year high school located in Round Lake, Illinois, a northern suburb of Chicago, in the United States. It is part of Round Lake Area Schools District 116.

Round Lake competes in the Northern Lake County Conference. Their nickname is the Panthers. The following IHSA sanctioned sports are offered:

This article's list of alumni may not follow Wikipedia's verifiability policy. Please improve this article by removing names that do not have independent reliable sources showing they merit inclusion in this article AND are alumni, or by incorporating the relevant publications into the body of the article through appropriate citations. (February 2017)

• Tim Unroe, Former MLB infielder (Milwaukee Brewers, Anaheim Angels, Atlanta Braves)
• Tom Wittum, all-pro punter for San Francisco

• Official website