"Dear @airindiain cockroaches on food plates at your Delhi Lounge for business and first class passengers.
Disgusting," Harinder Baweja, a journalist by profession, tweeted along with a picture of a roach on her plate.
The airline apologised for the incident on the micro blogging site and said the catering services provider had been asked to take corrective measures.
"We are sorry to hear this, Ms Harinder...We have alerted the agency managing lounge at T3 (Terminal 3). Necessary corrective measures are being taken immediately. We deeply apologise for this incident," it responded in a series of tweets.
An airline source said that Air India subsidiary Hotel Corporation of India, which manages Centaur group of hotels, provides catering services at its lounge.