The animals, currently being cared for at East Winch Wildlife Centre, were all found in Norfolk in recent weeks, entangled in man-made debris.
One was trapped in a flying ring, another with a plastic bag around its neck and the third was caught in fishing gear.
A photo of the ring (Image: RSPCA)
Evangelos Achilleos, centre manager, said: “It is heartbreaking and just unbelievable that we have had three entangled seals rescued in as many weeks.
“We are just so grateful to the rescue teams who patiently wait until the right opportunity to save the seals and then bring them to us for rehabilitation.
One seal was caught on a plastic bag (Image: RSPCA)
“What is also so upsetting is that all the items caught on these seals were man-made.”
East Winch has dealt with 104 seals with similar “necklace” injuries since 2008, caused by netting, line, or plastic rings.
Of those, 95 were successfully rehabilitated and released, while nine died or were put to sleep due to the severity of their injuries.