| Krtíš | |
| Subdivision Type1: | Country |
| Subdivision Name1: | Slovakia |
| Mouth: | Ipeľ |
| Mouth Coordinates: | 48.0886°N 19.308°W |
| Progression: | Ipeľ→ |
| Length: | 35.5km (22.1miles) |
| Basin Size: | 234km2 |
Krtíš is a river in southern central Slovakia. It flows through Zvolen and Veľký Krtíš districts, through the towns of Modrý Kameň and Veľký Krtíš. It enters the Ipeľ river near Slovenské Ďarmoty as a right tributary. It is 35.5km (22.1miles) long and its basin size is 234km2.[1]