A Melbourne schoolboy claims to be the first Australian denied a US visa following President Donald Trump's controversial entry bans.

Pouya Ghadirian, 15, was born in Australia but holds dual Iranian-Australian citizenship by descent.

He said he was planning to go on "space camp", a dream trip to the US with his school, where he would visit Orlando, Washington, and the US Space and Rocket Center in Alabama.

His visa interview was set for Monday morning.