WikiTree is a genealogy website that allows users to research and to contribute to family trees while building and collaborating on a singular worldwide family tree within the same system. WikiTree is free for the user and financed via advertisements displayed to unregistered users. WikiTree is owned and hosted by founder's company Interesting.com, Inc.
As of October 2023, the WikiTree website claimed that the site had more than 1 million registered members and contained more than 36 million profiles of people, with over 12 million profiles of people who should share a detectable amount of DNA with tested site members, their deceased relatives, or those whose remains have been tested posthumously. As of July 2023, SimilarWeb ranked WikiTree as eighth in total World Wide Web traffic among "Ancestry and Genealogy" websites.