Until now the submarine was owned by Defence Equipment and Support (DE&S), the MOD’s body responsible for procuring and supporting equipment for the armed forces.
The boat and her crew will now be added to the Royal Navy Fleet alongside the Navy’s other units.
Defence Minister Philip Dunne said, “The handover of Artful to the Royal Navy is another major step in the Astute Class submarine program, which continues to gather pace.
"These attack submarines, will provide the Royal Navy with the most technologically advanced submarine Britain has ever sent to sea and will be a vital part of UK security for decades to come.
“They are being funded by our growing Defence budget and our £178 billion investment in equipment, which is delivering the very best possible kit to our Armed Forces.”