The Marine and Fisheries Division (Welsh: Is-adran Môr a Physgodfeydd)^[1] is a division of the Welsh Government whose purpose is to protect and regulate the fishing industry in the seas around Wales.

Its equivalent organisations elsewhere in the United Kingdom are the Marine Management Organisation in England, and the Marine Directorate in Scotland.

The division maintains a multi-million pound fleet consisting of five Fisheries Patrol Vessels (FPVs)—high speed boats used for law enforcement and protecting the fishing industry from illegal activity. They were built in Pembrokeshire by Mainstay Marine Solutions,^[2] and named after prominent Welsh people.

An ensign for use aboard ships used by the Welsh Government, such as the patrol boats of the Marine and Fisheries Division, was granted in 2017.^[6]

The flag is a British blue ensign defaced with a yellow dragon with red claws and tongue. Such blue ensigns are conventionally used to indicate government-controlled ships, and the dragon is a traditional symbol of Wales.

It was designed in 2017 at the request of the Welsh Government by Red Dragon Flagmakers in conjunction with Thomas Woodcock, the Garter Principal King of Arms. On 19 December 2017, the flag's use by the Welsh Government was authorised by the UK Defence Secretary, and was registered with the College of Arms in January 2018.