| Casalmaiocco | |
| Official Name: | Comune di Casalmaiocco |
| Coordinates: | 45.2333°N 39°W |
| Region: | Lombardy |
| Province: | Lodi (LO) |
| Frazioni: | Madonnina |
| Mayor: | Marco Vighi |
| Area Total Km2: | 4.7 |
| Population Footnotes: | [1] |
| Population Total: | 3182 |
| Population As Of: | 31 May 2017 |
| Population Demonym: | Casalini |
| Elevation M: | 88 |
| Postal Code: | 26831 |
| Area Code: | 02 |
Casalmaiocco (Lodigiano: Casalmaiòcch) is a comune (municipality) in the Province of Lodi in the Italian region Lombardy, located about 25km (16miles) southeast of Milan and about 15km (09miles) north of Lodi.
Casalmaiocco borders the following municipalities: Mulazzano, Dresano, Vizzolo Predabissi, Tavazzano con Villavesco and Sordio.