The Wild Dolphins project was organised by Wild in Art along with the Archie Foundation at the Royal Aberdeen Children's Hospital, and Whale and Dolphin Conservation (WDC).
For the last 10 weeks they have been the most photographed and talked about attractions in the city.
They were in parks, shopping centres, the beach and museums.
The models will now be auctioned.
The auction will be held at Aberdeen's Music Hall on Wednesday 10 September from 19:00.
Proceeds will be split between Archie and WDC.
A popular arts project which brought 50 life-sized fibre glass dolphins to Aberdeen is drawing to a close.