'Bachelorette' contestant Leo Dottavio is under investigation for sexual harassment, and his job as a stuntman at Universal Studios might hang in the balance ... TMZ has learned.

Sources familiar with the situation tell TMZ ... a complaint with human resources was filed Friday by someone who claims to have witnessed Leo making several women uncomfortable on the set with excessive hugging and unwanted flirting.

The complaint also mentions Leo sliding into the women's DMs and making them uncomfortable with the conversation.

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We're told the person who filed the complaint says the alleged behavior went down at the end of 2017 when Leo worked on the "Water World" show ... but before he was cast on 'Bachelorette.'

He'd been working on "Water World" for 3 and a half years, but he was taken off the schedule in response to the initial allegations made by a former 'Bachelor' contestant ... who publicly accused him of sexually harassing women more than a decade ago. Leo denied those claims.

We've reached out to Leo who tells us he's unaware of the more recent allegations.

We reached out to Universal and a spokesperson tells TMZ, "We are aware of the situation and have taken appropriate actions" ... referring to the suspension.