Mona is an unincorporated community and census-designated place in Mitchell County, Iowa, United States.

[4] Around that time, Mona had begun to decline in importance when most railroading business had been transferred to Lyle, Minnesota, across the Iowa-Minnesota border.

U.S. Route 218 runs along the northeast edge of the community, leading south 8 miles (13 km) to St. Ansgar, the post office serving Mona, and 20 miles (32 km) to Osage, the Mitchell county seat.

According to the U.S. Census Bureau, the Mona CDP has an area of 2.28 square miles (5.91 km2), all land.

[1] Otter Creek runs through the east side of the community, flowing southwest to the Cedar River at Otranto.