The greatest number of people to sing the same National or regional anthem at the same time is 121,653, and was achieved by Sahara India Pariwar (India), in Lucknow, India, on 6 May 2013.
Sahara India Pariwar is deemed to be the second largest employer in India with over 1,100,000 employees. All the participants were dressed in company uniform and came from within a 400km radius of the venue. The number was verified by professional audit firms with two GWR Adjudicators present. 2,564 participants were discounted.
Comments below may relate to previous holders of this record.