Kalša (Hungarian: Kalsa) is a village and municipality in Košice-okolie District in the Košice Region of eastern Slovakia.

The village of Kalša lies at the southeastern foot of the Slanské vrchy mountains in the Podslanská hills.

In the medieval age it belonged to local landowners, later it became the property of the city of Košice by deposit and sale.

In the past, the population was involved in traditional agriculture, logging and carting.

The village lies at an altitude of 202 metres and covers an area of 4.627 km².