The RNID has linked up with the Trades Union Congress to warn leisure industry employers of the increased risk of deafness posed by 24-hour pub opening.
The charity warns that changes to the Licensing Act that are due to come into force next month will expose workers in pubs, bars and clubs to dangerously loud noise for longer periods.
Both groups are highlighting the issue as part of European Week for Safety and Health at Work from 24 to 30 October.
They are urging employers to remove or reduce loud noise by redesign of venues, better information and effective hearing protection.
Brian Lamb, director of communications at RNID, said: "With more licensed premises opening longer and playing loud, amplified music, staff working in bars, clubs and pubs might not realise their hearing is being put at such high risk."