Oberstudienrat [oːbɐˈʃtuːdi̯ənˌʁaːt] (male) or Oberstudienrätin [oːbɐˈʃtuːdi̯ənˌʁɛːtɪn] (female; both abbreviated with OStR; literally "senior councillor of studies" or "senior educational councillor") is an official title for a certain rank of teacher in Germany, mostly employed in state-run grammar schools.
An Oberstudienrat is remunerated according to category "A 14", which means a salary of at least some 50 000 € per year, exactly as much as the lower-half Lieutenant Colonels, and after at least two but no more than eight years of service is roughly as much as the lowest rank of judges and state prosecutors.
[1][2] The Oberstudienrat is the position immediately superior to the Studienrat (Educational Councillor).
[3] About 20 percent of civil servants at educational institutions in Germany are Oberstudienräte (2014).
In the former German Democratic Republic, Oberstudienrat was not used as denominating a rank but solely as an honorary title of high reputation.