Rimdidim, Mountain summit in Odenwald, Germany

Rimdidim is a 498.5 m high mountain in the Odenwald, on the boundary between Fränkisch-Crumbach and Fischbachtal. Its wooded summit plateau lies in the northwest of Fränkisch-Crumbach's forest, while the steep north slope above Meßbach belongs to Fischbachtal. A small block field of the Flasergranitoid zone lies on the west slope.

The summit was recorded as Arnstein, a boundary point of the Rodensteiner Mark. The name Rimdidim is said to come from a Whitsunday storm on 15 May 1898 that uprooted all trees on the Arnstein. According to local accounts, Mayor Albrecht Ohly of Darmstadt later remarked in Odenwald dialect that from there one had the most beautiful view 'rimdidim' (all around) in the Odenwald.

The name Rimdidim comes from Odenwald dialect: after a whirlwind on Ascension Day, 15 May 1898, uprooted every tree on the summit, then called Arnstein, Mayor Albrecht Ohly of Darmstadt is said to have remarked to a forester that the view now stretched "rimdidim" all around the Odenwald. The rock group at the summit was a geological natural monument from 27 May 1959 until 27 November 1996.

Three cul-de-sac roads end near the Rimdidim: the K 71 branches off the L 3102 at Steinau's western edge to a hikers' car park at the village's southern edge, the K 72 runs from the L 3102 to Meßbach at the northern foot, and the K 76 leads from near Reichelsheim through Eberbach to Hofgut Rodenstein at the south-east foot. The northern slope drops steeply. Marked circular routes cross the summit, including the Ökumenischer Pilgerweg and the Gagernstein 3: Daumensteinrundweg.

Near the border with neighboring Hahlkopf stood the Nature Friends House Rimdidim until it became a fire ruin in 2001, serving as a recognizable landmark for hikers for many years. The decaying remains of this former hostel are still visible to observant visitors today and tell of the area's recreational past.