Securitas AB is a security services (security guarding and mobile patrolling), monitoring, consulting and investigation group, based in Stockholm, Sweden. The group has over 300,000 employees in 53 countries worldwide. Securitas AB is listed at Nasdaq OMX Stockholm, Large Cap segment.

Securitas AB owns and operates the Swiss security company Protectas AG in Switzerland, where there already existed a security company called Securitas AG, part of the Swiss Securitas Group. It is also the parent company of the Pinkerton Detective Agency.