| Seiichi Eto | |
| Office2: | Member of House of Representatives from Kyushu |
| Constituency2: | Kyushu PR |
| Office3: | Member of House of Representatives from Ōita |
| Predecessor3: | Eijiro Hata |
| Successor3: | Seat Abolished |
| Constituency3: | Former 1st district (1990-1996) 1st district (1996-2000) |
| Office4: | Minister of State for Okinawa and Northern Territories Affairs |
| Predecessor4: | Mitsuhiro Miyakoshi |
| Successor4: | Taro Kono |
| Office5: | Minister of State for Consumer and Food Safety |
| Predecessor5: | Mitsuhiro Miyakoshi |
| Successor5: | Shinji Inoue |
| Office6: | Minister of State for Declining Birth Rates |
| Predecessor6: | Mitsuhiro Miyakoshi |
| Successor6: | Satoshi Sakamoto |
| Office7: | Minister of State for Ocean Policy |
| Predecessor7: | Mitsuhiro Miyakoshi |
| Successor7: | Hachiro Okonogi |
| Birth Date: | 1 October 1947 |
| Birth Place: | Oita, Japan |
| Party: | Liberal Democratic Party |
| Alma Mater: | Oita University (BEc) |
| Office1: | Member of the House of Councillors |
| Constituency1: | National PR |
is a Japanese politician of the Liberal Democratic Party, a member of the House of Councillors in the Diet (national legislature). A native of Ōita, Ōita and graduate of Oita University, he had served in the city assembly of Ōita for two terms since 1973 and the assembly of Ōita Prefecture for two terms since 1979. He was elected to the House of Representatives for the first time in 1990 after an unsuccessful run in 1986. In 2000 he lost the seat but was re-elected three years later. He, however, lost the seat again in 2005. In 2007 he ran for the House of Councillors and was elected.
In 2019 Eto entered the 4th Abe cabinet as the Minister of state for Okinawa and Northern Territories Affairs.
Eto is affiliated to the openly revisionist lobby Nippon Kaigi.[1]