Johannes Trefz (born 7 June 1992 in Starnberg) is a German sprinter specialising in the 400 metres. He won a bronze medal in the 4 × 400 metres relay at the 2011 European Junior Championships. He plays for .
His personal best in the event is 45.70 seconds set in Nuremberg in 2018.
In 2019, he won the bronze medal in the team event at the 2019 European Games held in Minsk, Belarus.
International competitions Representing 2011European Junior ChampionshipsTallinn, Estonia13th (sf)400 m47.853rd4 × 400 m relay3:08.562013European U23 ChampionshipsTampere, Finland9th (h)400 m46.974th4 × 400 m relay3:05.242015World RelaysNassau, Bahamas3rd (B)4 × 400 m relay3:04.902016European ChampionshipsAmsterdam, Netherlands15th (sf)400 m46.078th4 × 400 m relay3:05.672017World RelaysNassau, Bahamas6th (B)4 × 400 m relay3:09.532018World CupLondon, United Kingdom3rd4 × 400 m relay3:03.16European ChampionshipsBerlin, Germany19th (h)400 m46.538th4 × 400 m relay3:04.692019World RelaysYokohama, Japan6th (B)4 × 400 m relay3:05.35
References