The king brown snake ('Pseudechis australis') is a species of highly venomous snake of the family 'Elapidae', native to northern, western, and Central Australia. Despite its common name, it is a member of the genus 'Pseudechis' (black snakes) and only distantly related to true brown snakes.

It is a robust snake up to 3.3 m (11 ft) long. It is variable in appearance, with individuals from northern Australia having tan upper parts, while those from southern Australia are dark brown to blackish. Sometimes, it is seen in a reddish-green texture. The dorsal scales are two-toned, sometimes giving the snake a patterned appearance. Its underside is cream or white, often with orange splotches. The species is oviparous.

King brown snakes are habitat generalists, inhabiting woodlands, hummock grasslands, chenopod scrublands, and gibber or sandy deserts nearly devoid of vegetation. Within the arid to semiarid parts of their range, however, they prefer areas of greater moisture such as watercourses.

The king brown snake is mostly crepuscular (active at dusk), and is less active during the middle of the day and between midnight and dawn, retiring to crevices in the soil, old animal burrows, or under rocks or logs. During warmer months, its activity shifts to later after dusk and into the evening. Across its range, it is more active during the day in cooler climates and at night in hotter climates.

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