Buchenbach, Brook in the Rems-Murr district, Baden-Württemberg, Germany

The Buchenbach is a 24 km long left tributary of the Murr in Baden-Württemberg. It rises at about 425 m on the northern edge of the Berglen near the Rudersberg hamlet of Königsbronnhof, flows through Rettersburg and Oppelsbohm, then turns northwest at Erlenhof and continues via Winnenden and Leutenbach to its mouth between Burgstall and Kirchberg. Its 62 km² catchment is the largest among the Murr's tributaries.

This brook shaped settlement patterns from medieval times, when villages grew along its banks and used its water power for mills and daily needs. The historical importance is reflected in old mill sites and village layouts that remain visible in the landscape today.

The brook gives its name to the Buchenbachtal, the central valley of the Berglen, around which the villages of Rettersburg and Oppelsbohm are grouped. Near Erlenhof it turns sharply northwest before the Buocher Höhe, and in Winnenden it borders the old town on the northeast.

The Buchenbach can be followed on foot near Winnenden, where it borders the old town on the northeast, and at Leutenbach. Below Leutenbach the valley cuts into Muschelkalk and narrows; the last five kilometres, apart from the two settlements, are a protected area with no room for paths or fields. The Backnang–Ludwigsburg railway crosses the stream just before its mouth.

The Buchenbach is the longest tributary of the Murr and, after the Bottwar, has the second-largest catchment area at about 62 square kilometres. Its source lies at roughly 425 metres above sea level near the Königsbronnhof hamlet, about 700 metres to the south-east.