Regency Road (and its eastern section as Muller Road) is a main east-west road forming a continuous connection between the inner northern suburbs of Adelaide, South Australia.

Located approximately 6 kilometres (3.7 mi) north of the city centre, Regency Road carries a large amount of freight traffic, being located near Regency Park and the Churchill Road industrial area.

Regency Road commences at the intersection of Torrens Road and David Terrance outside Arndale Shopping Centre, Kilkenny and heads east through Prospect to meet Hampstead Road in Broadview, where it continues eastwards as Muller Road to end at North East Road in Hampstead Gardens.

[3] In 1970, four years after the Islington Sewage Farm had closed and the land fallen into disuse, the new suburb of Regency Park was created on the site and named in honour of Queen Elizabeth II (the regent) who visited Adelaide that year.

Construction started in 2019 and was completed in March 2021.