Maybe NBC should’ve asked Ronan Farrow to conduct its investigation of the Matt Lauer harassment scandal.

Because the network’s internal probe — which concluded that no NBC managers had the slightest hint of any inappropriate behavior by its now-fired “Today Show” star and that no culture of harassment exists — certainly is raising a lot of eyebrows.

For one thing, unlike other media outlets with similar big-name scandals, NBC did its own investigation instead of hiring an impartial outsider.

Plus, others openly question the report’s conclusion that NBC management was totally in the dark until the first news stories about Lauer were published. Lauer’s former co-host, Ann Curry, told The Washington Post that back in 2012 she told two supervisors about Lauer sexually harassing a staffer physically. (NBC said it had no record of her warning, and the managers denied it.)

The paper also says it found 12 other women who claim they were harassed at NBC News, three of them by Lauer.

And even the network’s lame report admitted to staff “concerns” about reporting harassment: a fear of retaliation; a belief that complaints wouldn’t be kept confidential; unease that NBC human-resources officials all sat in glass-walled offices. That makes NBC’s denials suspicious, to say the least.

Which brings us back to Farrow: His work on the issue certainly could’ve given NBC’s investigation rock-solid credibility.

Then again, he had to take his groundbreaking Harvey Weinstein exposé to The New Yorker because NBC rejected it.