The 1990 UK Athletics Championships was the national championship in outdoor track and field for the United Kingdom held at Cardiff Athletics Stadium, Cardiff. It was the first time that the event was held in the Welsh capital. Strong winds affected several of the sprint races and jumps on the programme. A women's triple jump was contested for the first time.

The 1990 AAA Championships was an outdoor track and field competition organised by the Amateur Athletic Association (AAA), held from 3–4 August at Alexander Stadium in Birmingham, England. It was considered the de facto national championships for the United Kingdom, ahead of the 1990 UK Athletics Championships.