The Avro 534 Baby (originally named the "Popular") was a British single-seat light sporting biplane built shortly after the First World War.

The Avro Baby was a single-bay biplane of conventional configuration with a wire-braced wooden structure covered in canvas.

The fourth (counting the short-lived prototype) Baby was designated Type 534B, distinguished by its plywood-covered fuselage and reduced-span lower wing.

This "Venetian blind" wing design was proposed and previously explored by Horatio Phillips in the last decade of the 19th century.

[7] The Babies were raced in the early 1920s by a variety of pilots but are best remembered for the flights of G-EACQ in the hands of Bert Hinkler.

On 24 July, he won second place in the handicap category of the Aerial Derby at Hendon, and on 11 April 1921 set a new distance record in Australia when he flew the Baby non-stop from Sydney to his home town of Bundaberg 800 mi (1,288 km) away, making the flight in 8 hours 40 minutes.

In June 1922, another Baby made the first flight between London and Moscow when the Russian Gwaiter collected his machine from Hamble and flew it home.