Emil Viyachki (; born 18 May 1990) is a Bulgarian professional footballer who plays as a defender for Arda Kardzhali.
Viyachki made his professional debut for Marek Dupnitsa in a match against Botev Vratsa in the B Group. Before that he played in amateur divisions with the club.
After the club was promoted to the A Group, Viyachki played in the first match for the team in the 1st league. In May 2020, Viyachki tested positive for COVID-19. In June 2024, he joined Arda Kardzhali.
Viyachki played for Bulgarian amateurs national team for the European Cup.