Interstate 124 (I-124) is an unsigned designation for a short segment of a controlled-access highway located in Chattanooga, Tennessee.

The road segment has not been signed as I-124 since the late 1980s (it is marked on overhead signs and milemarkers as US 27),[3] and the Tennessee Department of Transportation official map no longer designates it as I-124, but some DOT publications still make reference to the designation, and its exit numbers remain.

[6] The section of highway between Martin Luther King Jr. Boulevard was built between 1955 and 1959.

The interchange with I-24, known as the "Big Scramble", was reworked in the late 1980s and early 1990s, and the I-124 signage was removed at this time.

[3] A major reconstruction project commenced in December 2015 to widen and modernize I-124, which reconstructed all interchanges, provided adequate shoulders and median dividers, widened the route to six lanes, and removed the S-curve at the 4th Street interchange.