Atlantic City Boulevard, Main Street, Lakewood Road
- Direction:
 - North/South
 - Southern Terminus:
 - US 9 in Beachwood
 - Northern Terminus:
 - US 9 and Garden State Parkway (NJ 444) in Toms River
 - Distance:
 - 3.73 miles
 - Counties:
 - Ocean
 - Signed:
 - Yes
 
NJ 166 is a short north/south route in Beachwood and Toms River through the area where US 9 is routed along the Garden State Parkway (NJ 444). It has both of its termini at US 9 and serves as the functional equivalent of a business route despite having its own route number. The entire length is a two-lane undivided road with traffic lights.
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