The concern is not just the high profile thefts from major collections or museums either, as the majority of thefts are from private collections that have been subject to a break-in and entry. We list here some of the places to register your lost, stolen or looted art, or track and try to recover lost artworks.

Trace claims to be the worlds largest global online database of lost, stolen and seized property. You have to register to use the site but once you have done so the searching and registering of lost property is free.
http://www.trace.com

This organisation runs a group of services to help the art collector.
It has a central resource that allows individuals to register lost artwork or valuable items and it also allows buyers to check art they are considering a purchase on has been stolen or lost. It also has a register of fake and forged works of art.
It claims to have over 100,000 items on its database and it has had some notable successes recovering art that has been lost or stolen for a considerable time.

https://www.artloss.com/content/home

The Lost Art Database is run by the Koordinierungsstelle für Kulturgutverluste, Germany’s central office for the documentation of lost cultural property. It was set up jointly by the Government and the Länder of the Federal Republic of Germany and registers cultural objects which as a result of persecution under the Nazi dictatorship and the Second World War were relocated, moved or seized, especially from Jewish owners.

The site contains data on cultural objects which as a result of Nazi persecution or the direct result consequences of the second world war was removed and relocated, stored or seized from their owners.
http://www.lostart.de/

A good resource to help find lost art and collectables throughout the world. A host of different links that cover databases of stolen art and their recovery, including many of the dedicated police sites from around the world. It also has a database of art stolen from well known artists.
http://www.saztv.com/

The Metropolitan Police have a database of over 50,000 items of stolen property on their database including a section dealing with recently recovered art and collectable items.

http://www.met.police.uk/artandantiques/

This is a good resource even if you do not live in LA. It has art theft news, has a database of stolen and lost art plus a group of other well put together articles on the subject.
http://www.lapdonline.org/art_theft_detail

This website shows the most recent stolen works of art as reported to INTERPOL and works of art that has been recovered but for which owners have not been identified.
It also a section that has posters of the most sort after stolen works of art.
Interestingly there is a news section that gives updates on theft of art, and recovered art.

http://www.interpol.int/Public/WorkofArt

An independent resource dedicated to the retrieval of stolen artefacts. The site is by no means comprehensive but they claim to have over 20,000 items on display.

http://www.iasa-online.com/

This site is put together by the ICOM (International Council of Museums). Orginally they concentrated on lost African artefacts and listing the many items that have been looted from their, mainly archaeological items. The ICOM set up the site to help create a common framework to tackle this crime. They now also have Red Lists covering: Latin America; Iraqi and Afganistan.
http://icom.museum/redlist/

This database was developed to assist the various UK police forces recover and return stolen antiques. It has a large database of stolen, recovered art and collectables.
http://www.findstolenart.com/