Illinois Route 47 (IL 47) is a 169.76-mile-long (273.20 km) largely rural north–south state highway that runs from the Wisconsin state border at Highway 120 near Hebron, to IL 10, just south of Interstate 72 (I-72) near Seymour. IL 47 is in primarily rural areas but in several suburbs of Chicago, such as Woodstock, traffic can be heavily congested.

IL 47 crosses most interstate highways in northern and central Illinois, but the largest towns that it serves are Woodstock (at US 14), Huntley (at I-90), Lily Lake at (IL 64), Elburn (at IL 38), Sugar Grove (at US 30), Yorkville (at US 34), Morris (at I-80), Dwight (at I-55), Forrest (at US 24), Gibson City (at IL 54), and Mahomet (at I-74).