"Achterbahn" (English: "Rollercoaster") is a song by German singer Helene Fischer.

It was written by Konstantin Scherer, Nico Santos, Vincent Stein, Wim Treuner, and Robin Haefs for her self-titled eighth studio album (2017), while production was helmed by trio Madizin, consisting of Patrick Benzner, Dave Roth, and Serhat Sakin, and Silverjam.

Taking Fischer's music work further away from the schlager genre, the uplifting dance pop song is built around a synthesizer instrumentation and features slight Auto-Tune vocal effects.

[1] Lyrically, it details its narrator's feelings towards her lover which she compares with a roller coaster ride.

[3][4] Dutch DJ Afrojack was consulted to produce additional remixes of the song, which appeared on a digital extended play.