If families get separated after war, a natural disaster or migration, we trace missing relatives around the world and put them back in contact.
There are several organisations that can help you find someone in the UK or overseas.
International Day of the Disappeared is on 30 August, every year - when we recognise the numbers of people still missing through conflict, disaster and migration.
For more than 100 years, the Red Cross has helped people find those they have lost because of conflict or disaster. Read their stories.