The Night White Mountains was a summer-only overnight passenger train jointly operated by the Boston and Maine Railroad and the New Haven Railroad between Bretton Woods, New Hampshire, and New York City, New York.

Its primary purpose was to connect vacationers from New York City to New Hampshire's White Mountains including the Mount Washington Hotel and Mount Washington Cog Railway.

It was briefly an all-Pullman service before World War II.

While it offered mostly open section sleeping compartments immediately after the war, it transitioned to mostly private rooms to better match the tastes of its exclusive clientele.

It used heavyweight sleeping cars and even offered Pullman through coaches to Washington, DC.