Grinius
{{pavarde|m=Grinius
|fm=Grinienė/Griniuvienė
|fu=Griniūtė
| fs =
| origin =
| related = :ru:Гринь (Grin')
| footnotes =
}}
Grinius is a Lithuanian language family name. It may refer to:
- Kazys Grinius, 3rd President of Lithuania
- Kęstutis Grinius, Lithuanian politician
- Marius Grinius, Canadian diplomat
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