Adventure Island has introduced a rule ordering males to wear shirts during the summer period.
Bare torsos have been outlawed in-line with the park’s desire to be a “family-orientated business”.
The Southend-based amusement park’s managing director told the Southend Standard newspaper: “We don’t have a strict dress code as such, but would like our male customers to show some decorum.
“In recent years, we’ve seen increasing numbers of lads and men whipping their tops off, eager to make the most of the sun – which is understandable, of course, as Southend is the warmest and driest part of the UK.
“That’s absolutely fine in the right environment, but we try very hard to be a family-focused business and not everybody is a fan of bare chests.
“We simply want to make sure that Adventure Island maintains its status as the best place to bring the whole family for a fun, safe, reasonably-priced great day out.”
Signs have been erected around the park, informing guests of the new rule.