All community members are free to use the Wikimedia trademarks under the terms of the WMF's trademark policy.
There are community logos which may be used with fewer limitations.
Affiliated entities recognized by the Foundation and its Affiliations Committee may have additional rights to use the Wikimedia marks.
Each chapter enters into a Chapter Agreement with the WMF which specifies the right and duty to use the Wikimedia logo in relation to their work; and provides the right to non-commercial use of the Wikimedia logo & the related Chapter logo.
Further trademark agreements
Commercial use of the Wikimedia logo, and both commercial and non-commercial use of the other marks overseen by the WMF (beyond the uses open to any community member), are governed by separate Trademark Agreements.
Example trademark agreements