Largest barnacle
- Who
- Balanus nubilus
- What
- 12.7/7 dimension(s)
- Where
- United Kingdom
- When
- Not applicable
The world's largest species of barnacle is the giant acorn barnacle Balanus nubilus. Standing up to 12.7 cm (5 in) high, it measures up to 7 cm (2.76 in) across.