Dishonored is from Arkane: https://en.wikipedia.org/wiki/Arkane_Studios#Games_developed

I'd highly recommend Dishonored 2, Prey, and Deathloop as well. You will love them if you like Dishonored 1.

As for being Bethesda... it's confusing.

There's Bethesda Softworks, which is a giant publisher, a 'brand' with a bunch of studios under them. Including Arkane.

Then there's Bethesda Game Studios, the game dev, owned by Bethesda Softworks. When most gamers say 'Bethesda', they're usually referring to BGS, as they're the ones that make the Elder Scrolls/Fallout games, as well as Starfield.

...And just to add to the confusion, all this was bought by Microsoft.