Veterans Highway, Smithtown Bypass, Nesconset Highway
- Direction:
 - East/West
 - Western Terminus:
 - Northern Parkway and Veterans Highway (NY 454) in Hauppauge
 - Eastern Terminus:
 - NY 25A in Mount Sinai
 - Distance:
 - 14.48 miles
 - Counties:
 - Suffolk
 - Signed:
 - Yes
 
NY 347 begins at the eastern terminus of the Northern Parkway in Hauppauge. At this point, it is multiplexed with Veterans Highway (NY 454). A short distance east of the Northern Parkway, NY 347 splits off from Veterans Highway (NY 454) as Smithtown Bypass and runs to the northeast. When it crosses the Smithtown-Brookhaven town line, it becomes Nesconset Highway. It ends at NY 25A, just east of NY 112 in Port Jefferson.
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