Grŵp Llandrillo Menai (GLlM) is an umbrella organisation overseeing the operation of three member colleges in North Wales: Coleg Llandrillo, Coleg Menai and Coleg Meirion-Dwyfor.

[2] It employs 1,650 staff and delivers courses to around 34,000 students across north-west Wales and central north Wales in the counties of Anglesey, Conwy County Borough, Denbighshire and Gwynedd.

As well as thirteen learning sites, the group owns business and research facilities.

[3] Grŵp Llandrillo Menai's thirteen sites are within the following local communities: Abergele, Bangor, Caernarfon, Colwyn Bay, Denbigh, Dolgellau, Glynllifon (near Llandwrog), Holyhead, Llangefni, Parc Menai (in Treborth near Bangor), Pwllheli, Rhos-on-Sea (near Colwyn Bay) and Rhyl.

Of those, the three principal campuses—that both cover a large area with multiple buildings and act as the headquarters of a constituent college—are, in descending order of size: