The Sonneberg, also called the Buchberg, is a hill in the Lusatian Highlands of eastern Germany with a height of 401.0 m above sea level (NN). It is the fourth highest hill in the borough of Neusalza-Spremberg in Saxony, after the Fuchsberg (422 m) and Hahneberg (410 m) and an unnamed peak about 600 metres north of the Sonneberg (403.2 m).