The commitment was made this week by Morrisons chief executive, Marc Bolland, to the British Pig Executive (BPEX) to support the British pig farming industry.
Immediately upon the agreement, Morrisons said it cancelled any further orders of imported fresh pork and within a week will only be selling British fresh pork in their stores.
Bolland commented: "We've listened and responded to the concerns expressed by BPEX and aim to support the British pig industry through this period of great difficulties.
"This announcement confirms our strong relationship and commitment to British farmers and by sourcing 100% British fresh pork we hope to further help ensure a sustainable British supply chain."
Stewart Houston, chairman of BPEX, said: "Being the first of the big four retailers to make this move only reinforces how seriously Morrisons takes the industry's situation and we are grateful for their support at this time. We are extremely pleased with this commitment and would urge other retailers to follow their impressive lead."