The singer, who was set to perform across Australia and New Zealand in March and April as part of his 50th anniversary tour, has cancelled all his dates on doctors advice.

Legendary singer, songwriter and performer Neil Diamond today announced his retirement from touring due to his recent diagnosis of Parkinsons disease, a statement on his website said.

He has already played across the US and Europe for the anniversary tour.

It is with great reluctance and disappointment that I announce my retirement from concert touring, Diamond said.

I have been so honoured to bring my shows to the public for the past 50 years. My sincerest apologies to everyone who purchased tickets and were planning to come to the upcoming shows.

I plan to remain active in writing, recording and other projects for a long time to come.

My thanks goes out to my loyal and devoted audiences around the world. You will always have my appreciation for your support and encouragement. This ride has been so good, so good, so good thanks to you.

The Australian promoter Paul Dainty, who was working on the upcoming tour, said he was devastated and saddened at the news of Diamonds illness and retirement.

I have had the honour of promoting Neils numerous tours in Australia and New Zealand, Dainty said. The is one of the worlds greatest artists and we and his thousands and thousands of fans here will miss seeing him tour down under.

The singer was set to perform in stadiums, arenas and wineries in Townsville, the Sunshine Coast, Brisbane, Sydney, Bendigo, Melbourne, the Hunter Valley, Adelaide, Perth, Christchurch and Napier.

Tickets purchased by credit or debit card will be refunded in full. Ticketek will be in contact with people who bought tickets with cash or using eftpos to arrange refunds.