| Subdivision: | County |
| Nation: | Iowa |
| Conventional Long Name: | Crocker County |
| Image Map Caption: | Location within the U.S. state of Iowa |
| Year Start: | 1870 |
| Year End: | 1871 |
| Membership Title1: | Country |
| Membership1: |  United States |
| Membership Title2: | State |
| P1: | Kossuth County, IowaKossuth County |
| P2: | Bancroft County, IowaBancroft County |
| S1: | Kossuth County, IowaKossuth County |
| Today: | United States |
Crocker County is a defunct county in the U.S. state of Iowa. In 1870, the Iowa General Assembly created Crocker County from the northern part of Kossuth County. The county seat was located at Greenwood, Iowa. In December 1871, the Iowa Supreme Court declared the act creating this county a violation of the constitution, which in article eleven declares that no new county shall be created which contains less than 432sqmi. As Crocker County was smaller than the law allowed for, it ceased to exist from and after the rendition of that decision and the twelve townships in its territory reverted to Kossuth County.[1] [2]
See main article: Larrabee County, Iowa. On February 22, 1913, legislation was introduced again to create a new county in the northern area of Kossuth. The proposed region would be called Larrabee County. It was named after governor William Larrabee.[3] The proposal failed after a referendum.