| Office: | Minister of Education |
| Term Start: | 27 May 1966 |
| Term End: | 22 March 1968 |
| Primeminister: | Rafael Paasio |
| Predecessor: | Jussi Saukkonen |
| Successor: | Johannes Virolainen |
| Term Start2: | 18 December 1963 |
| Term End2: | 12 September 1964 |
| Primeminister2: | Reino R. Lehto |
| Predecessor2: | Armi Hosia |
| Successor2: | Jussi Saukkonen |
| Term Start3: | 29 November 1957 |
| Term End3: | 26 April 1958 |
| Primeminister3: | Rainer von Fieandt |
| Predecessor3: | Kerttu Saalasti |
| Successor3: | Kustaa Vilkuna |
| Term Start4: | 20 September 1951 |
| Term End4: | 9 July 1953 |
| Primeminister4: | Urho Kekkonen |
| Predecessor4: | Lennart Heljas |
| Successor4: | Johannes Virolainen |
| Term Start5: | 29 July 1948 |
| Term End5: | 17 March 1950 |
| Primeminister5: | Karl-August Fagerholm |
| Predecessor5: | Lennart Heljas |
| Successor5: | Lennart Heljas |
| Office6: | Deputy Prime Minister of Finland |
| Term Start6: | 27 May 1966 |
| Term End6: | 22 March 1968 |
| Primeminister6: | Rafael Paasio |
| Predecessor6: | Ahti Karjalainen |
| Successor6: | Johannes Virolainen |
| Term Start7: | 12 June 1964 |
| Term End7: | 12 September 1964 |
| Primeminister7: | Reino R. Lehto |
| Predecessor7: | Aarne Nuorvala |
| Successor7: | Ahti Karjalainen |
| Term Start8: | 29 November 1957 |
| Term End8: | 26 April 1958 |
| Primeminister8: | Rainer von Fieandt |
| Predecessor8: | Johannes Virolainen |
| Successor8: | Tyyne Leivo-Larsson |
| Birth Name: | Reino Henrik Oittinen |
| Birth Date: | 26 July 1912 |
| Birth Place: | Helsinki, Finland |
| Death Place: | Helsinki, Finland |
| Spouse: | Ellen Adele Valtonen |
| Party: | Social Democratic |
Reino Henrik Oittinen (26 July 1912, Helsinki – 1 March 1978) was a Finnish politician from the Social Democratic Party.
In the 1930s, Oittinen participated in the municipal politics in Tampere. He was chosen as Finnish Minister of Education on four occasions: 1948–1950, 1951–1953, 1957–1958 and 1966–1968. Oittinen was also Deputy Prime Minister in three cabinets, those of 1957–1958, 1963–1964 and 1966–1968.[1] He also served as the director general of National Board of General Education from 1950 to 1972. Oittinen received the honorary title of Minister in 1971.
Oittinen was the nephew of the politicians Ida Vihuri and Kaisa Hiilelä.[2]