北加利福尼亚州（英语：Northern California）是一个位于美国加利福尼亚州北部的大都市圈。北加州的主要人口集中地包括旧金山湾区（其中的城市有旧金山、奥克兰和圣荷西）以及加州首府沙加缅度和其都会区。北加州内华达山脉内的尤塞米提谷、太浩湖、沙斯塔山（喀斯喀特山脉中的第二高山）和中央谷地北部亦都拥有一些红木林。另外，北加州亦是全世界其中一个最具生产力的农业地区。

北加州是美国11个大都市圈的其中一个。北加州西达旧金山湾区，东至太浩湖和雷诺；南到弗雷斯诺都会区，北达大沙加缅度。

早于公元前8,000年至5,000年，美洲原住民已开始陆续迁入北加州。随着大量原住民迁入，北加州成了哥伦布到达前的北美洲中人口密度最高的地方。而于16至18世纪中叶期间来到北美洲的欧洲探险家亦没有在北加州创建殖民地。到了1770年，来自蒙特雷的西班牙传教士是首批移居北加州的欧洲人。

Northern California, often abbreviated NorCal, is the northern portion of the U.S. state of California. Spanning the state's northernmost 48 counties, in contrast to the 10 counties of Southern California, its main population centers include the San Francisco Bay Area (anchored by the cities of San Francisco, San Jose, and Oakland), the Greater Sacramento area (anchored by the state capital Sacramento), and the Metropolitan Fresno area (anchored by the city of Fresno). Northern California also contains redwood forests, along with the Sierra Nevada including Yosemite Valley and part of Lake Tahoe, Mount Shasta (the second-highest peak in the Cascade Range after Mount Rainier in Washington), and the northern portion of the Central Valley, one of the world's most productive agricultural regions.