Pia Nielsen is a retired female badminton player of Denmark.

One of Europe's better all-around female players in the late 1970s and early 1980s, Nielsen played particularly well in the IBF's first three World Championships.

She won a bronze medal at the 1977 World Championships in women's doubles with Inge Borgström, a bronze medal in mixed doubles at the 1980 World Championships with Steen Fladberg, and a silver medal in mixed doubles with Fladberg in the 1983 Championships.

She was a women's doubles bronze medalist at the 1978 European Championships with Inge Borgstrom when beaten by Nora Perry and Anne Statt of England in semifinals with 14–17, 11–15,[1] and a women's doubles silver medalist in the 1980 edition of that tournament with Kirsten Larsen.

This biographical article relating to Danish badminton is a stub.