The company has declared the strike illegal and said availability of its products in the market will not be impacted by workers' stir.
In a filing to the BSE, the company said the contract workers at its factory located in Delhi have gone on an illegal strike.
"The said illegal strike has had a partial impact on the production/operation at the said factory," it said.
Further, the company said: "This illegal strike has a very small impact on the overall business/operation of the company, including the availability of the finished products in the market."
The company, however, did not specify the reasons for the strike by the contract workers.
Britannia Industries sells a variety of biscuit brands, including Good Day, Tiger, 50-50, Marie Gold, apart from dairy products and cakes.
Shares of Britannia Industries were trading at Rs 982 per scrip in the afternoon trade, up 0.18 per cent from the previous close on the BSE.