Up to 1,000 people die every year due to a shortage of organs for transplant, NHS blood and transplant said.
To register to become a donor, visit the NHS website.
You can also join when registering for a driving licence or car tax, applying for a Boots Advantage card, registering with a GP or registering for a European Health Insurance Card (EHIC).
More top news
Rain for the northwest, dry and cold elsewhere
Rejecting a showdown with Ed Miliband, David Cameron's terms sent to broadcasters reveal his deep dissatisfaction with the debate proposals.
The owners of what some people claim to be the 'Welsh Holy Grail' are offering a cash reward for the ancient artefact's safe return.