The Wulka () is a river of Burgenland, Austria. Its basin area is .
The river springs near Forchtenstein and the border to Lower Austria. It flows through Trausdorf an der Wulka and discharges near Donnerskirchen into Lake Neusiedl, in former times a runoff-free lake, but nowadays drained by an artificial channel, the , into the Danube.
An article in the Journal of Hydrology stated that "Waste water treatment plants contributed up to 68% of monthly flow of River Wulka into the lake."