Heikki Seppä (March 8, 1927 – May 18, 2010) was a Finnish American master metalsmith, educator, and author. Born in Säkkijärvi, Finland. In 1941 he studied metalsmithing at Goldsmith's School in Helsinki, and later at the Georg Jensen silver factory in Copenhagen. In 1950 he emigrated with his first wife to Prince Rupert, British Columbia. Then they moved to Bloomfield Hills, Michigan where he attended Cranbrook Academy of Art.
Seppä taught art in Louisville, Kentucky (1960–1965) then at the St. Louis School of Fine Arts at Washington University in St. Louis from 1965 till his retirement at 1992 as Professor Emeritus. He is a founding member of the Society of North American Goldsmiths. His metal sculptures are in private collections, as well as in museums including the Renwick Gallery of the Smithsonian American Art Museum.
For much of his childhood, Seppä lived in a children's home until leaving at age 14 to attend the Goldsmith's School. His first wife emigrated with him from Finland and they stayed together until her passing in 1993. In 1998, he moved to Bainbridge Island, Washington and married metalsmith Laurie A. Lyall. He died at his Bainbridge home at age 83.
- American Craft Council Fellow and national treasure 1987
- Art and Education Council Award, St. Louis 1996
- The Hans Christiansen award, Society of American Silversmiths 2003
- "Oral history interview with Heikki Seppa. 2001 May 6". Archives of American Art, Smithsonian. Retrieved May 19, 2011.
- "Remembering: Heikki Seppä". American Craft Magazine. Retrieved May 19, 2011.
- "In Memoriam: Heikki Seppä". Society of North American Goldsmiths. Archived from the original on May 20, 2011. Retrieved May 19, 2011.
- "Eliot Society members gather to celebrate university's accomplishments". The Source. 2018-06-06. Retrieved 2018-06-06.
- "Heikki Seppä | Bainbridge Island Review". Bainbridge Island Review. 2010-05-18. Retrieved 2018-06-06.