The Weidas, also called the Weidasserbach, is a roughly eleven-kilometre-long, orographically right-hand tributary of the Selz in the German region of Rhenish Hesse.

The Weidas rises near Freimersheim and empties into the Rhine tributary of the Selz near Framersheim from the southwest. From its source to Dautenheim [de] (a district of Alzey) it is also called the Aufspringbach. It flows in sequence through Wahlheim, Kettenheim, Dautenheim and Gau-Heppenheim.

• Aufspring (left), south of Freimersheim, 0.7 km (0.43 mi)
• Freimersheimer Bach (Flutgraben) (left), north of Freimersheim, 0.8 km (0.50 mi)
• Esselborn (Esselborner Bach) (right), near the Hessensteigermühle mill, 2.1 km (1.3 mi)
• Gau-Heppenheimerbach (right), northeast of the Mohrenmühle [de] mill, 1.8 km (1.1 mi)

• List of rivers of Rhineland-Palatinate