Gabalfa (English: /ɡəˈbælvə/, Welsh pronunciation: [ɡaˈbalva]) is a district and community in the north of the city of Cardiff, capital of Wales. It is characterised by a four-lane flyover road at the Gabalfa Interchange, where the A48 road meets the A470 road (North Road) which leads from Cardiff to northern Wales, and the A469 road (Caerphilly Road).

The name is derived from the Welsh Ceubalfa, literally translated as 'place of the boat'. It was formerly the site of a ferry crossing across the River Taff, upon which a school is now built. The area was first heavily developed in the 1880s, with most of the characteristic terraced housing originating from the next 30 years of construction.

The area around St. Joseph's Church near to Companies House is known as 'the Colonies' due to a number of streets named after former British colonies, including Australia Road and Newfoundland Road.

Gabalfa has three primary schools, with a combined attendance of more than 720:

Gabalfa Primary School is not within modern Gabalfa but in neighbouring Llandaff North.

Gabalfa has one comprehensive school, Cathays High School, with around 900 students (mainly from outside Gabalfa).

Gabalfa has a high student population. There are several halls of residence for Cardiff University in the area, housing about 3,100 students, some 10% of the student body. Liberty House serves mainly medical and nursing students at the nearly University Hospital of Wales. In addition, many students live in privately rented accommodation in the area.

Churches in Gabalfa include St Mark's on North Road (Church in Wales), St Joseph's on New Zealand Road (Roman Catholic), and the All Nations Church on Eastern Avenue (Ministries Without Borders, co-located with the All Nations Centre).