Heidi Marianne Pelttari (born 2 August 1985 in Tampere) is a retired Finnish hockey defenceman who played with the Tampereen Ilves in the Naisten SM-sarja and with the Finnish national team (Naisleijonat).
She competed at both the 2006 and 2010 Winter Olympic Games with Naisleijonat.
Pelttari was also a stand out defensemen for the Minnesota–Duluth Bulldogs women's ice hockey program.