可可尼诺县（英语：Coconino County）是美国亚利桑那州北部的一个县，北邻犹他州，位于旗杆镇都会区内，面积48,332平方公里。根据美国2010年人口普查，共有人口134,421。县治弗拉格斯塔夫。可可尼诺县的面积为18,661平方英里（48,300平方公里），是美国面积第二大的县份。可可尼诺县的总面积比美国九个面积最小的州份要大。

科科尼诺县的土着人口比例相对其他县份来说很高（约30%），而大部份土着为纳瓦霍人。

Coconino County is a county located in the north central part of the U.S. state of Arizona. The population was 134,421 at the 2010 census. The county seat is Flagstaff. The county takes its name from Cohonino, a name applied to the Havasupai. It is the second largest county by land area in the 48 contiguous United States, behind San Bernardino County, California, with its 18,661 square miles (48,300 km) making it larger than each of the nine smallest states.