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President Trump's immigration order has Hollywood execs and actors freaking out ... because Muslim and Middle Eastern roles are pivotal for a bunch of TV shows.

Casting sources tell us ... the 2 networks hit the hardest by Trump's order are NBC and Netflix. "For God and Country" -- produced by the "Homeland" folks -- have a pilot order from NBC which calls for a number of Middle Eastern actors.

We're told Netflix has a show in the works which also features numerous Middle Eastern characters.

Marc Cherry has an untitled pilot for ABC as well that’s set to star a late 20's Middle Eastern man ... alongside Reba McEntire.