N45 may refer to:
Transportation
*
N45 (Long Island bus)
The following bus routes are operated in Nassau County, New York. Most of these routes are operated under Nassau Inter-County Express (NICE), formerly MTA Long Island Bus, except in Greater Long Beach, where that city operates its own bus servic ...
*
BMW N45
The BMW N45 is a naturally aspirated four-cylinder petrol engine which replaced the BMW N40 and was produced from 2004-2011. It was produced alongside the BMW N46 engine and only sold in several countries, where vehicle taxes favoured small-displ ...
, an automobile engine
*
Kobelt Airport, in Ulster County, New York, United States
*
N-45 National Highway
The National Highway 45 (), also known as the N-45 or the Nowshera-Chitral Highway, is one of the National Highways of Pakistan, running from Nowshera District to the town of Chitral via Dir in the Khyber Pakhtunkhwa province. It is a two-lane ...
, in Pakistan
*
Nebraska Highway 45
Nebraska Highway 45 is a highway in Nebraska. It runs in a south-to-north direction for . It has a southern terminus at Nebraska Highway 91 south of Newman Grove. It has a northern terminus in Tilden at an intersection with U.S. Highway 275.
...
, in the United States
Military
* , a ''Grampus''-class submarine of the Royal Navy sunk in 1940
* , a T-class submarine of the Royal Navy scrapped in 1947
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