Scotland in Union
| Abbreviation | SIU |
|---|---|
| Founded | 6 March 2015 |
| Type | Campaign group |
| Headquarters | Glasgow |
| Location |
|
| Membership | 37,000 (2025) |
Founder | Alastair Cameron |
| Website | www |
Scotland in Union (SIU) is a campaign group which aims to keep Scotland within the United Kingdom. It was set up in 2015, and has 37,000 signed-up supporters as of 2025.