Mettawa is a village in Lake County, Illinois, United States. Per the 2020 census, the population was 533. The village maintains trails for pedestrian, bicycle and equestrian usage. Five forest preserves of the Lake County Forest Preserve District are located within village boundaries.

The name of the town derived from Potawatomi chief Mettaywah, who lived in the area before signing the 1833 Treaty of Chicago and being displaced to Kansas. The traveler Colbee reported visiting the chief's village near the Des Plaines River and eating pork, cakes fried in pork fat, and a corn and bean dish. Many Potawatomi returned to Illinois annually until the end of the nineteenth century to visit their burial grounds.

Mettawa was founded by area residents in 1960 who worked together with a common goal of protecting their rural area from encroaching commercial development. Mettawa's first mayor was James Getz; subsequent mayors included Edward FitzSimons, Julius Abler, Barry McLean and Jess Ray. The current treasurer is Amy Weiland. Famous residents and property owners within the area now known as Mettawa have included two-time presidential nominee Adlai E. Stevenson, city planner Edward H. Bennett, and more recently, news anchor and rancher Bill Kurtis and Chicago Bears' linebacker Brian Urlacher (brother of current Mettawa Mayor Casey Urlacher) and running back Matt Forte. Stevenson's Mettawa estate on the Des Plaines River is a designated Illinois Historic Site and is listed on the National Register of Historic Places.

Mettawa was founded by conservationist landowners and continues to be a center of land conservation and restoration activities. The village also supports a rural, equestrian-friendly lifestyle. Some residents maintain small farming operations, and there are eight horse stables within the village's borders.

The Mettawa Open Lands Association (MOLA) is a non-profit organization which promotes quality open space within the village and encourages the protection of public and private open lands. MOLA supports Mettawa-area residents and open lands (including unincorporated housing developments that are surrounded by village land) with public workdays and educational programs, and provides quality open space management on village properties. In celebration of Mettawa's 50th anniversary in 2010, MOLA distributed complimentary wildflower seed packets to all village residents and to many residents in neighboring areas, and suggested that recipients plant the seeds along roadsides to help beautify the area.

MOLA maintains the Whippoorwill Farm Preserve, an open lands area owned by the village (just west of I-94 at the northwest corner of IL-60/Townline Road and Riverwoods Boulevard). Whippoorwill Farm is currently undergoing restoration to a native prairie/wetland habitat.