The shirts have a picture of Colston’s empty plinth with a rope hanging off, with debris and a discarded sign nearby and BRISTOL written above.
On Instagram, Banksy said: “Next week the four people charged with pulling down Colston’s statue in Bristol are going on trial.
“I’ve made some souvenir shirts to mark the occasion. Available from various outlets in the city from tomorrow. All proceeds to the defendants so they can go for a pint.”
He said sales would be limited to one per person and each t-shirt would cost £25 plus VAT.
Rhian Graham, 29, Milo Ponsford, 25, Jake Skuse, 36, and Sage Willoughby, 21, face trial at Bristol Crown Court from Monday.
The bronze memorial to the 17th century slave merchant was pulled down during a Black Lives Matter protest on June 7 last year, before being dumped in Bristol Harbour and later recovered by Bristol City Council.
Charges allege that the four defendants, without lawful excuse, jointly and with others, damaged the statue, a listed monument belonging to the city council.
The defendants are accused of committing the offence “intending to destroy or damage such property or being reckless as to whether such property would be destroyed or damaged”.