The police recorded 40.4 crimes per 1,000 people a year in Helensburgh from January 2023 to December 2025, 26% lower than the typical Scottish town's 54.4. The most common was violence and sexual offences, at 12.1. In the 12 months to December 2025 it was 40.4, down from 40.6 in the 12 months to December 2023.