Nansen was an unincorporated community in Chickasaw County, Iowa, United States.

It was at the junction of 170th Street and Pembroke Avenue.

[1] Nansen was established in Section 10 of Jacksonville Township,[2][note 1] a few miles northeast of the county seat of New Hampton.

Nansen's post office operated from 1897 to 1904.

[4] Nansen was noted in a 1932 article about Chickasaw County's lost villages.