Steffen Grummt (born 15 September 1959 in Wilkau-Haßlau, Saxony) is an East German decathlete who competed from the late 1970s to 1983. He later competed in bobsleigh in the mid-1980s.
As a decathlete, Grummt finished eighth at the 1980 Summer Olympics in Moscow. He also finished fourth at the 1982 European Championships in Athletics in Athens and eighth at the 1983 World Championships in Athletics in Helsinki. Following East Germany's boycott of the 1984 Summer Olympics in Los Angeles, Grummt switched to bobsleigh where he found better success.
In bobsledding, Grummt won a complete set of medals at the FIBT World Championships with a gold (Four-man: 1985), a silver (Two-man: 1985), and a bronze (Two-man: 1986).
Grummt is head of the sports school in Mainz, Germany. He is married to Kornelia Ender who won a combined nine medals in women's swimming at the Summer Olympics in both 1972 and 1976.