As of my knowledge cut-off date in early 2023, China was the most populous country in the world. However, the population of India has been growing rapidly, and recent reports indicate that India may have surpassed China in population in 2023. Unfortunately, I don't have current data to confirm.

I recommend checking the latest data from reliable sources, such as:

• United Nations: https://www.un.org/en/global-issues/population
• World Bank: https://data.worldbank.org/indicator/SP.POP.TOTL