The supermarket, which is a signatory of WRAP’s Plastic Pact, will now make the discs from cardboard rather than polystyrene.
This will remove 180 tonnes of plastic from circulation per year and mean 500 fewer trucks are needed to transport the waste.
Aldi is also making its ‘Thin & Crispy’ pizza cartons smaller which it predicts will cut the 73 tonnes of waste per year.
Fritz Walleczek, managing director of corporate responsibility at Aldi UK, said: “Polystyrene pizza discs are a serial offender when it comes to waste packaging, so it’s important that we tackle this issue directly.
“This move is one part of a much larger campaign to reduce our environmental impact wherever possible – be that food waste, packaging or emissions.”
Earlier this year Aldi announced a 10-point plastics and packaging pledge that will see it scrap all single-use plastic bags by the end of this year and ensure all own-label product packaging is fully recyclable by 2022.