Mike Maczey (born 28 September 1972) is a retired German decathlete.

He finished seventh at the 1996 European Indoor Championships,^[1] ninth at the 1998 European Indoor Championships,^[2] eighth at the 1998 European Championships and sixth at the 2002 European Championships. He also competed at the 2000 Olympic Games.

Maczey became German champion in 1997 and 1999.^[3] His personal best score was 8461 points, achieved in June 2000 in Götzis.