The Avro 519 was an aircraft utilized by the British during the First World War, which was developed from the Avro 510 seaplane.
These biplanes were of conventional configuration and featured two bays, with an uneven span.
The Royal Naval Air Service ordered two single seat models in early 1916, which were powered by a single 150 hp (110 kW) Sunbeam water cooled engine.
Shortly thereafter, the Royal Flying Corps ordered two modified aircraft with seats for a crew of two and more powerful (225 hp/168 kW) Sunbeam engines.
Ultimately, only four of these aircraft were constructed.