Dr. Oz is being dragged to court by an L.A. Armenian meat market owner ... claiming the former TV doc falsely tied her shop to massive healthcare fraud and the mafia in a viral video.

According to a new lawsuit -- obtained by TMZ -- Anna Ivanyan, who owns Tigranakert Meat Market in Van Nuys, says Oz trashed her reputation by featuring her business in a clip about alleged fraud in the Armenian community.

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In late January ... Oz posted a video across social media showing him riding in a car and posing outside businesses, claiming billions of dollars in healthcare fraud -- including alleged hospice schemes -- are tied to what he describes as the “Russian Armenian Mafia.”

Ivanyan says Oz filmed right outside her business while laying this out ... making it look like her shop is part of a criminal operation -- something she says is completely false.

The lawsuit claims the video reached millions of viewers ... and Oz's defamatory statements were also amplified by L.A. local news outlets, which added fuel to the fire.

As a result ... Ivanyan claims the alleged defamatory statements spread rapidly -- reaching her customers and the broader community. She says the video hurt her business and reputation … and she’s now seeking damages.

We reached out to reps for Oz ... so far, no word back.