| Dolná Blava | |
| Mouth Coordinates: | 48.33°N 17.669°W |
| Progression: | Dolný Dudváh→ Čierna voda→ |
| Subdivision Type1: | Country |
| Subdivision Name1: | Slovakia |
| Length: | 9.8km (06.1miles) |
| Tributaries Right: | Krupský potok |
| Basin Size: | 143km2 |
The Dolná Blava is a right tributary of the Dolný Dudváh in Trnava District, Western Slovakia. It flows into the Dolný Dudváh near Križovany nad Dudváhom. It is 9.8km (06.1miles) long and its basin size is 143km2.[1]