北达科他州（英语：State of North Dakota）是美国中西部的一州。它是大草原里最北的一州，包含达科他地区的北半部。19世纪时，北达科塔被认为是美国旧西部的一部份。北达科他在成州之前是达科他属地的一部份，以美国原住民的达科塔族而名；北达科他在1889年加入联邦，是美国的第39/40州。

密苏里河流经北达科他的西部，在盖瑞森水坝（Garrison Dam）后形成萨卡加维亚湖。北达科他西半部是多山丘的，富有矿产如褐煤和原油。红河在东部形成红河谷，谷里包括许多富饶的农地。农业长久以来对北达科他的文化造成很大影响，也是重要经济来源。

North Dakota (pronunciation: /ˌnɔːrθ dəˈkoʊtə/; locally [ˌno̞ɹθ dəˈko̞ɾə]) is the 39th state of the United States, having been admitted to the union on November 2, 1889.

It is located in the Upper Midwestern region of the United States, bordered by the Canadian provinces of Saskatchewan and Manitoba to the north, the states of Minnesota to the east, South Dakota to the south, and Montana to the west. The state capital is Bismarck, and the largest city is Fargo. North Dakota is the 19th most extensive but the 4th least populous and the 4th least densely populated of the 50 United States.