Thomas Ambrosius (born 4 July 1969) is a Danish former footballer who played as a striker.
Ambrosius was born in 1969 in Denmark. He is a native of Jutland, Denmark.
Ambrosius started his career with Danish side Viborg FF. In 1994, he signed for Danish side Aarhus Gymnastikforening. In 1995, he signed for Danish side BK Herning Fremad. In 1999, he signed for Danish side FC Midtjylland. In 2000, he signed for Austrian side Schwarz-WeiàBregenz. He was regarded as one of the club's most important players. In 2001, he signed for Austrian side FC Kärnten. In 2004, he signed for Austrian side BSV Bad Bleiberg. After that, he signed for Danish side Lyngby BK. He retired from professional football at the age of thirty-six.
Ambrosius has been married. He has a daughter and a son.