The 71-year-old royal also praised parents who have had to homeschool their children, even amid challenges such as a lack of access to the internet.
He said in a video message: “Parents have done an astonishing job in such trying circumstances and to see teachers and schools going above and beyond for their pupils in response to this pandemic has been, in many instances, quite remarkable.
“From finding creative ways to teach lessons remotely, and even making sure the most vulnerable children do not go without meals, we all owe them a huge debt of gratitude.”
Charles also praised the work of Teach First, a charity which aims to build a “fair education for all” and said he was “extremely proud” to be their patron.