The camera, broadcasting 24/7, has been launched by Belvue Guesthouse, which opened at Chare Ends in 2018.
At the end of their first season its owners were looking for new ways to connect with their visitors and with fans of the Island.
"A webcam was a perfect opportunity," said owner Danny Dagan. "I only wish we had it up and running during the Beast from the East in 2018, when the castle was covered in snow.
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“Still, after only a few days, we're already getting great feedback from people keen to see the island on a live stream, and maybe feel closer to it, even if only digitally."
Hundreds of thousands of visitors come to Holy Island every year, and now they will be able to reconnect with the Island digitally, watch the castle and the ever changing seasonal scenery around it, as well as the typical high volume of bird traffic, especially during autumn and spring migrations.
The camera is set to a wide angle, so that it captures the big skies over the Island, especially during sunrise.
At night-time, there is very little light pollution, so the picture is quite dark, but keen-eyed web visitors will be able to spot the navigation beacons outside the harbour, and Longstone Lighthouse flashing in the distance.
The camera can be accessed on www.holy-island.uk/lindisfarne-castle-webcam-live/