多尼芬县（Doniphan County, Kansas，简称DP）是位于美国堪萨斯州东北角的一个县，东、北隔密苏里河与密苏里州相望，西北邻内布拉斯加州。面积1,028平方公里。根据2000年美国人口普查，共有人口8,249人。县治特洛伊 (Troy)。

成立于1855年8月25日，县名纪念美墨战争时期的骑兵司令亚历山大·W·多尼芬 (Alexander W. Doniphan)。

Doniphan County (county code DP) is a county located in the U.S. state of Kansas. As of the 2010 census, the county population was 7,945. Its county seat is Troy, and its most populous city is Wathena.

Doniphan County is included in the St. Joseph, MO-KS Metropolitan Statistical Area, which is also included in the Kansas City-Overland Park-Kansas City, MO-KS Combined Statistical Area.