Flaris LAR01, also variously called the LAR 1 and LAR-1, is a Polish five-seat very light jet, currently under development by Metal-Master of Jelenia Góra. It is the only single-engined very light jet currently being developed by a non-American aircraft manufacturer.

The programme was publicly unveiled at the 2013 Paris Air Show, and has been promoted to private owner-operators and corporate customers, as well as commercial operators. Originally intended to perform its maiden flight as early as 2013, the prototype first flew on 5 April 2019.

The Flaris LAR01 project was started by Sylwia and Rafał Ładzińscy with the assistance of the Instytut Lotnictwa, Instytut Techniczny Wojsk Lotniczych, Politechnika Warszawska, Politechnika Wrocławska and Wojskowa Akademia Techniczna. According to Ładziński, the aircraft had emerged from an ambition to produce an affordable aircraft that would be well-suited to short-haul point-to-point routes and operated by a variety of commercial, corporate, and private owners that sought to progress from operating piston engine and turboprop-powered aircraft. Rafał Ładziński, who had co-originated the aircraft's design with Sylwia Ładziński, serves as the head of the FLARIS project and the chief of Research and Development. The chief designer is Andrzej Frydrychewicz. Significant work on the aircraft's aerodynamics was performed by Krzysztof Kubryński.

In June 2013, the existence of the LAR01 programme was publicly unveiled at the 2013 Paris Air Show. Among the attributes of the aircraft emphasised during its initial announcement were its unique and previously-unserved role in the general aviation market, ease of flight, lightweight construction, low operational cost, safety, and versatility. The company has forecast a demand for the type of hundreds of aircraft per year.

During the 2013 event, at which a prototype of the aircraft was displayed, it was announced that the LAR01 would be the first of three aircraft that manufacturer planned to launch; while few details were stated, it was said that of the two future aircraft, one would be smaller than the LAR01 while the other would be larger. In June 2015, at which point the subject of future family members was discussed in greater detail by the manufacturer, it was revealed that there were future ambitions for a series of business jets to be produced, and that the next design following on from the LAR01 was to adopt a twin-engine configuration.

During the 2013 reveal at the Paris airshow, it was stated that an initial prototype of the aircraft would fly later that same year, as well as speculation on the delivery of a batch of 20 aircraft during 2014. During March 2014, the non-flying first prototype was being used for non-destructive load testing, while the second prototype was announced as being intended to perform the type's maiden flight later that year; however, it was acknowledged at the time that there was a lack of certainty over exact dates. The order book is intended to be opened shortly after the maiden flight taking place. By May 2014, the company was already in the process of establishing an assembly line for the type, as well as beginning the construction of the third and fourth prototypes.

The second prototype was powered by a single Pratt & Whitney Canada PW610, although alternative powerplants were already under consideration to power subsequent production aircraft. Aerospace publication Aviation Week has attributed uncertainty over the engine as a reason for delays in the programme. Once in flight, the second prototype would participate in the certification programme, along with a further two prototypes; in December 2014, the manufacturer envisioned the construction of a total of five prototypes. Final CS-23 certification for the LAR01 from the European Aviation Safety Agency (EASA) was anticipated to occur roughly three years following the first flight. In February 2015, the second prototype commenced a series of taxi tests while it reportedly approached the end of ground-based testing.

In March 2015, it was stated that the type was expected to receive type certification during 2018. During 2015, it was stated that initial deliveries, then forecast to take place in 2016, would be validated under the Polish civil aviation authority's S-1 experimental aircraft designation, prior to full EASA certification being issued. In February 2016, it was stated that the first flight of the LAR01 was set to take place within the following months. In July 2016, engine ground tests of a LAR-1 equipped with the Williams FJ33-5A, which is to be used in production aircraft, commenced. In February 2017, it was reported that the LAR01 has entered the final stage of ground testing and would perform its first flight within the first half of the year. According to the company, it has been working closely with the Polish civil aviation authority on tests of the onboard systems, including the final tests of the aircraft's detachable wing and cabin pressurisation system.