The supermarket will donate 2p to food redistribution charity FareShare for every individual and multipack sale of fresh fruit and veg before 9 August.
Over the three-week campaign, Tesco said it expected to sell enough fruit and veg to donate up to three million meals to the charity.
The move comes with more than 2.3 million children in the UK living in households that have experienced food insecurity in the last six months, a situation that has worsened during the pandemic.
It also follows hot on the heels of Henry Dimbleby’s National Food Strategy, which called for a raft of measures to help young people suffering food insecurity.
The ‘Buy One to Help a Child’ scheme builds on Tesco’s existing food redistribution programme, which last year provided more than 29 million meals of surplus food.
“In the last year, FareShare has doubled the amount of food we’re providing to people struggling to get enough to eat ,” said FareShare CEO Lindsay Boswell.
“While the lockdown may be easing, we know food insecurity remains high.”
Tesco UK CEO Jason Tarry said: “We wanted to find a really simple way to do our bit and help our customers do the same. We hope Buy One to Help a Child will encourage healthier choices for our customers at the same time as helping to feed children who need it most, so we can continue to help support the communities in which we live and work.”