The retailer will roll out the fully recyclable, card-based porridge pots at all its UK stores from early next year.
Aldi said this will make it the first supermarket to implement such a change.
The switch to cardboard packaging is expected to prevent an estimated 175t of plastic from going onto the market each year.
Aldi plastic and packaging director Richard Gorman said: “Moving to card for our porridge pots is yet another step forward in our commitment to reducing the use of plastic across our products.
“We know how important protecting the environment is to our customers, which is why we are committed to making changes like this that help make a difference.”
The initiative is part of Aldi’s wider commitment to reducing and removing unnecessary plastic from its products.
In 2018, the retailer announced a goal to make all its own-label products recyclable, reusable or compostable by this year and do this for branded products sold at Aldi by 2025.
In May this year, it removed plastic shrink wrap from all its Corale baked bean multipacks in a move expected to prevent 78t of single-use plastic from being sent to landfill a year.
Aldi also plans to launch a pilot to remove the outer plastic wrap from its sweetcorn mini-packs at a number of its stores later this year.
Earlier this year, Aldi announced it would remove plastic packaging from its entire range of own-label Easter eggs. This will remove around 24t of plastic from its stores.
The move came after the retailer made several other packaging changes to its Easter product range, which had made it fully recyclable.