One of the three schools of wizardry which sent champions to the Triwizard Tournament in Harry Potter and the Goblet of Fire, the other two being Beauxbatons and Hogwarts. The headmaster of Durmstrang is Professor Karkaroff and its champion is the Quidditch ace Viktor Krum.

I can't find any separate references for 'durm' or 'strang' so I presume the name is a spoonerism from the German phrase Sturm und Drang. I have seen Sturm und Drang translated into English as 'storm and stress', but der Drang more literally means 'push' or 'pressure'. I suppose Karkaroff's involvement with the Dark Arts puts the students under lots of pressure!