Iowa Highway 224 (Iowa 224) is a state highway in central Iowa. Its begins at Iowa 224 between eight miles (13 km) north of Kellogg and ends 2 miles (3.2 km) south of Kellogg at exit 173 along Interstate 80 (I-80). It intersects U.S. Route 6 (US 6) near Kellogg. The highway, in conjunction with Iowa 14, is the most direct route from I-80 to Marshalltown.

Iowa 224 begins at exit 173, a diamond interchange, on I-80. From I-80, Iowa 224 travels north 1 + 1⁄2 miles (2.4 km) to an intersection with US 6 just south of Kellogg. On the southern edge of Kellogg, it crosses the North Skunk River and a line of the Iowa Interstate Railroad. Iowa 224 represents the eastern boundary of Kellogg as the vast majority of the town is to the west. North of Kellogg, the highway passes and provides access to Rock Creek State Park, which lies 3 miles (4.8 km) to the east. One mile (1.6 km) from its northern end, Iowa 224 breaks from its northerly path and turns west at Jasper County Road E17 (CR E17). It follows this west-leading stretch of highway until its end at Iowa Highway 14.

Iowa 224 to Iowa 14 is the most direct route to Marshalltown from westbound I-80. By avoiding Newton, where I-80 meets Iowa 14, drivers can save 15 miles (24 km).

Iowa 224 began as a short spur route connecting Kellogg to US 6. It remained a short spur until 1980, when it was extended along CR T22 south to I-80, and north to CR F17, where it turned west to connect to Iowa 14. These changes first appeared on the 1981 state map published by the Iowa Department of Transportation.

The entire route is in Jasper County.