It comes after the group raised £8m to fund its expansion following a stock market flotation in June.
Now the 11-strong chain - founded by Algerian-born Tony Kitous in 2008 - is to bolster its portfolio with three new restaurants in London and three regional sites.
Chaker Hanna, CEO of Comptoir Libanais said: “We’ve seen a real increase in demand for the fresh, nutritious and affordable food we offer so are excited to showcase the best of Lebanese cuisine to new local communities, businesses and families."
The London openings will include a 94-cover site on Soho’s Poland Street launching mid-September, and a 177 sq.m venue on Gloucester Road, Kensington opening in November.
Comptoir’s first in-store restaurant will launch at John Lewis’s flagship Oxford Street shop in October, targeting both shoppers and ‘destination diners’.
Outside the capital the brand’s first branches in the South West will open in Exeter in late-September and Bath in October, followed by a launch at Leeds' Trinity shopping centre in November.
All standalone restaurants will offer takeaway and delivery services and sell a retail range of imported foodie gifts, spices and sweets.
Hanna said: "We look forward to opening our doors to lots of mezze-lovers!”