The 1998 AAA Championships was an outdoor track and field competition organised by the Amateur Athletic Association (AAA), held from 24 to 26 July at Alexander Stadium in Birmingham, England. It was considered the de facto national championships for the United Kingdom.

The AAA Championships was an annual track and field competition organised by the Amateur Athletic Association of England. It was the foremost domestic athletics event in the United Kingdom during its lifetime, despite the existence of the official UK Athletics Championships organised by the then governing body for British athletics, the British Athletics Federation between 1977 and 1993, and again in 1997. It was succeeded by the British Athletics Championships, organised by the BEF's replacement/successor, UK Athletics under its brand name British Athletics.