| Mary Kvidal | |
| Office: | State Secretary for the Ministry of Finance and Customs |
| Term Start: | 1 November 1996 |
| Term End: | 17 October 1997 |
| Primeminister: | Thorbjørn Jagland |
| Minister: | Jens Stoltenberg |
| Office2: | State Secretary for the Ministry of Industry and Energy |
| Term Start2: | 1 January 1996 |
| Term End2: | 25 October 1996 |
| Primeminister2: | Gro Harlem Brundtland |
| Minister2: | Jens Stoltenberg |
| Office3: | Minister of Education and Church Affairs |
| Term Start3: | 13 June 1988 |
| Term End3: | 16 October 1989 |
| Primeminister3: | Gro Harlem Brundtland |
| Predecessor3: | Kirsti Kolle Grøndahl |
| Successor3: | Einar Steensnæs |
| Office4: | Member of the Norwegian Parliament |
| Term Start4: | 1 October 1989 |
| Term End4: | 30 September 1993 |
| Constituency4: | Sør-Trøndelag |
| Office5: | Deputy Member of the Norwegian Parliament |
| Term Start5: | 1 October 1985 |
| Term End5: | 30 September 1989 |
| Constituency5: | Sør-Trøndelag |
| Birth Name: | Mary Synnøve Kvidal |
| Birth Date: | 4 July 1943 |
| Birth Place: | Malvik, Sør-Trøndelag, Norway |
| Spouse: | Otto Kvidal |
| Children: | 1[1] |
| Party: | Labour |
Mary Synnøve Kvidal (born 4 July 1943) is a Norwegian school principal and politician for the Labour Party.
She was born in Malvik. After finishing her secondary education in 1963, she graduated from a teachers' college in 1965 and started working as a teacher in her native Malvik. After one year in Vikhammer she was hired at Hommelvik School in 1966, advancing to inspector in 1976 and principal from 1981 to 1988.
Kvidal was elected to Malvik municipal council from 1967 to 1971 and 1975 to 1979. She also held numerous other municipal and regional posts. She chaired Sør-Trøndelag Labour Party from 1987 to 1993, having previously been a board member since 1982 and deputy leader since 1984.
She was elected as a deputy representative to the Parliament of Norway from Sør-Trøndelag in 1985, and as a full representative in 1989. She served in Brundtland's Second Cabinet as Minister of Education and Church Affairs from 1988 to 1989. Kvidal later served in Brundtland's Third Cabinet and Jagland's Cabinet as State Secretary to the Minister of Industry and Energy in 1996 and to the Minister of Finance 1996–1997.
Kvidal finished her career as director of education in Malvik municipality from 1994 to 2005. In 2006 she was given the King's Medal of Merit in gold.
Outside of politics, Kvidal chaired the Norwegian State Housing Bank from 1986 to 1988 and the supervisory council of the Bank of Norway, was the deputy chair of the Norwegian Broadcasting Corporation in 1988, board member of Credit Supervisory Authority from 1994 to 1996 and member of the Norwegian Parliamentary Intelligence Oversight Committee from 2003 to 2006.