The milestone coincided with World Electric Vehicle Day on September 9, 2020.
Built at the Japanese manufacturer’s Sunderland plant, the car was delivered to a customer in Norway.
According to Nissan, over 14.8 billion cumulative clear-air kilometres have been driven by the model worldwide since it was launched in 2010.
If accurate, this would equate a CO2 reduction (at least at the tailpipe) of around 2.4 million tons.
The Leaf, now in its second generation, produces 110kW and 320Nm.
Voltage is drawn from a 40kWh lithium-ion battery, and the car has a WLTP-rated range of up to 270km.
According to the most recent VFACTS figures, 250 Leaf cars have been sold in Australia so far in 2020, representing slightly more than one per cent of all Nissan sales this year (23,979).
Locally, the Leaf is priced from $49,990 plus on-road costs.
It was the world’s best-selling electric car until 2019, when it was surpassed by the Tesla Model 3.