The Lounge Passport can be picked up in any Loungers venue for £3, with proceeds donated to local charities.
Customers can collect unique stickers each time they visit a new Lounge, with opportunities to unlock rewards including drinks, snacks and merch.
Each Lounge has a personalised sticker related to its name or location.
The group, which opened its 300th UK site earlier this month in Alton, East Hampshire, says it introduced the scheme in response to customers looking to track their visits to Lounges across the country.
Loungers has opened 21 new Lounges so far this year.
According to the group, each Lounge contributes an average of nearly £1m investment to the local high street it serves, and creates around 30 new jobs.
Founded in Bristol in 2002 by friends Alex Reilley, Jake Bishop and Dave Reid, Loungers first site opened on North Street, Bristol.
The all-day café/bar format grew quickly across the UK, and in 2010 sister brand Cosy Club launched with a focus on larger, more central venues and a more upscale feel.
Loungers introduced its third brand, Brightside, in 2022 and opened the first roadside site near Exeter in February 2023.
Earlier this year the group was sold to Fortress Investment Group for £354.4m.