List of national highways in Nepal

The National Highway System of Nepal is the group of main roads in Nepal. Any highway or road that connects east to west and north to south is considered a National Highway of Nepal.
National Highways are administered by the Department of Roads under the Ministry of Physical Infrastructure and Transport (Nepal).
According to the Statistics of National Highway SNH-2020/21 there are 80 National Highways in Nepal, with a total length of 14913 km.
The new report of the Road Department of Nepal "Statistics of National Highway SNH-2022/23" shows that a total of of new roads have been built in Nepal in a span of 1 year, thus the total length of National Highway in Nepal in the year 2023 has become

List of national highways

Sign	Name	Length	Lanes	Completion year	Status	Remarks
60px	Mahendra Highway	1028	4-6	1967	Operational
60px	Mechi Highway	352	2
60px	Pushpalal Highway	1787	2
60px	NH04 National Highway	15	4
60px	Postal Highway	1016	2
60px	Tamor Corridor	135	2		Under construction
60px	NH07 National Highway	66	2		Under construction
60px	Koshi Highway	320	2-4
60px	Madan Bhandari Highway	1200	2-4
60px	NH10 National Highway	92
60px	NH11 National Highway	19
60px	Sunkoshi Corridor	163
60px	BP Highway	160
60px	NH14 National Highway	100
60px	NH15 National Highway	128
60px	Sagarmatha Highway	144
60px	Prithvi Highway	173
60px	Pasang Lhamu Highway	65
60px	NH19 National Highway	220
60px	Siddhicharan Highway	193
60px	NH21 National Highway	24
60px	NH22 National Highway	48
60px	NH23 National Highway	291
60px	NH24 National Highway	29
60px	Bhanubhakta Acharya Highway	108
60px	NH26 National Highway	19
60px	NH27 National Highway	40
60px	Tamakoshi Corridor	281
60px	NH29 National Highway	30
60px	NH30 National Highway	36
60px	NH31 National Highway	25
60px	NH32 National Highway	30
60px	Kathmandu–Terai Expressway	76
60px	Araniko Highway	112	2-4-6	1967
60px	NH35 National Highway	25
60px	Birendra Highway	45
60px	Kanti Highway	86
60px	Kathmandu Outer Ringroad	68
60px	Kathmandu Ringroad	27	2-4-8	1977
60px	NH40 National Highway	26
60px	Tribhuvan Highway	155
60px	Trishuli Corridor	197
60px	Kalu Pandey Highway	57
60px	Madan Ashrit Highway	300
60px	NH45 National Highway	106
60px	NH46 National Highway	9
60px	Siddhartha Highway	184	2-4	1971
60px	Kaligandaki Corridor	254
60px	Badigad Corridor	98
60px	NH50 National Highway	30
60px	NH51 National Highway	83
60px	Lumbini Highway	222
60px	Swargadwari Highway	130
60px	Shahid Highway	211
60px	Rapti Highway	169
60px	Rara Highway	263
60px	Bheri Corridor	317
60px	Karnali Highway	538
60px	NH59 National Highway	154
60px	Panchkoshi Highway	302
60px	NH61 National Highway	168
60px	South Seti Highway	228
60px	NH63 National Highway	111
60px	Jaya Prithvi Bahadur Singh Highway	108
60px	Seti Corridor	296
60px	Mahakali Highway	350
60px	Mahakali Corridor	201
60px	Bhimkali Highway	80
60px	NH69 National Highway	42
60px	NH70 National Highway	46
60px	NH71 National Highway	170
60px	NH72 National Highway	23
60px	NH73 National Highway	25
60px	NH74 National Highway	50
60px	Sworna Sagarmatha Ringroad	44
60px	Bharatpur Ringroad	105
60px	Damak Ringroad	100
60px	NH79 National Highway	20
60px	NH80 National Highway	30

Corridors

When one or more roads run along a river, in Nepal it is called a corridor named after that river. There are some north-south corridors which include one or more highways.

#	Corridor	KM	Highway No.	ref
1	Koshi Corridor	385	NH06, NH02
2	Kaligandaki Corridor	444	NH47, NH48
3	Karnali Corridor	682	NH58
4	Mahakali Corridor	413	NH67, NH68

Trivia

Currently Mahendra Highway is the longest National Highway of Nepal which is long in total length. The highway runs eastmost point Kakarbhitta to western most point Gadda Chauki through the Terai region. After the completion of construction of Pushpalal Highway. It will be the longest highway of Nepal which is in length.
The shortest highway of Nepal is NH46 which is in length. It is a linking highway between Mahendra Highway to Postal Highway.
Probably NH48 (Kaligandaki Corridor) is the highest altitude motorable highway in Nepal. The highway runs on the elevation from to. It connects Tansen and other parts of the country with Korala.