auditor

(3)

‘auditor’ means any person conducting national compliance monitoring activities on behalf of the appropriate authority;

Also defined in

Regulation (EC) No 1221/2009 of the European Parliament and of the Council of 25 November 2009 on the voluntary… 32009R1221, Article 2, point (17)
an individual or group of individuals, belonging to an organisation itself or a natural or legal person external to that organisation, acting on behalf of that organisation, carrying out an assessment of, in particular, the environmental management system in place and determining conformity with…
Regulation (EC) No 761/2001 of the European Parliament and of the Council of 19 March 2001 allowing voluntary… 32001R0761, Article 2, point (n)
an individual or a team, belonging to the organisation personnel or external to the organisation, acting on behalf of the organisation's top management, possessing, individually or collectively, the competences referred to in Annex II, point 2.4 and being sufficiently independent of the activities…