| Teruhiko Mashiko | |
| Birth Date: | October 8, 1947 |
| Occupation: | Japanese politician |
| Party: | Democratic Party of Japan |
| Native Name: | 増子 輝彦 |
| Alma Mater: | Waseda University |
| Office: | Member of the House of Councillors of National Diet |
| Termstart: | 1990 |
| Termend: | 1996 |
| Birth Place: | Kōriyama, Fukushima |
| Office1: | Member of the House of Councillors of National Diet |
| Termstart1: | 2007 |
is a Japanese politician of the Democratic Party of Japan, a member of the House of Councillors in the Diet (national legislature).
A native of Kōriyama, Fukushima and graduate of Waseda University, he ran unsuccessfully for the House of Representatives in 1986 after serving in the assembly of Fukushima Prefecture for one term since 1983. He ran again in 1990 and was elected for the first time. After losing his seat in 1996, he ran unsuccessfully in 2000 but was elected in 2003. He lost his seat again in 2005. In 2007, he was elected, this time to the House of Councillors, for the first time.