It is the fourth time the brand has changed hands since being launched in 1987, when it created a new fresh soup category in the UK.
The $230m (£145m) deal to buy Daniels Group also includes sister brands Johnsons Juice and Farmhouse Fare.
Daniels Group was previously owned by catering group Singapore Airport Terminal Services.
Irwin Simon CEO of Hain Celestial says: “The acquisition of Daniels extends our presence into one of the fastest-growing healthy food segments in the UK, with a solid leadership position and platform for the growth of our combined operations. We will look to expand the distribution of certain Daniels brands throughout the rest of Europe, using our European-based sales organisation.”