Welcome to the Millennium Diner


All desserts made fresh by our on premise bakery
Cakes & pies are available for take-out
Gluten free items available

View the Menu

Proud to be serving Long Island

We are a family owned & operated Diner/Restaurant since the year 2000. Join us for our complete breakfast, lunch & dinner specials or our delicious late night Millennium Munchies. Millennium Diner is available for catering & private parties. We are constantly changing our daily special menu to adapt to everyone’s palette.  The best local diner located in the heart of Smithtown. 
Take-out is available.

Gift Cards Available

Looking for the perfect gift? Look no further- – Millennium Diner has gift cards available for purchase in-store.