Minsc is a returning character in Baldur’s Gate 3, just like Jaheira, but he is much more difficult to find and will require far more effort from your party in Act 3. Despite the challenges, I can help you locate the familiar face and even add him to your camp as a companion with the right moves along the way.
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Where to Find Minsc in Baldur’s Gate 3
You can find Minsc within the main vault room of the Counting House in Baldur’s Gate 3. The Counting House is located all the way south of the Lower City Central Wall portal. It’s hard to miss the house in the south because it sits by itself with two golden guards, only connected to land by a wide bridge.

Getting into the first section of the Counting House is easy, but you need to reach the main vault to find Minsc. I suggest talking to the head clerk and then convincing him to give you a temporary pass. Immediate violence is always an option to get lower into the vaults. However, it’s not necessary and the pass is far easier.
Grab your pass and then keep descending down until you reach the vault with a code. This will lead you to the main vault that is even lower, and just so happens to have a deal occurring with Glitterbeard. Interrupt the deal, and in the mimic chest, Minsc will pop out for a full reveal. That won’t be the end though, and your party members can change the outcome. If he escapes, then you need to find him yet again.
How to Find Minsc in the Sewers of BG3
Minsc will be hiding in the Abandoned Cistern of the City Sewers if he escapes the Counting House. The Abandoned Cistern is located all the way on the western side of the sewers, even beyond the Undercity Ruins. Follow the acid-covered pipes to find a hollowed-out pipe leading to the main room of the Abandoned Cistern.

Inside this room, you will find Minsc once again, and depending on your party composition, he may attack. Reaching this part of the game will allow you to complete your quests for the Underduke and the Counting House.
Related: Baldur’s Gate 3: Should You Return the Counting House Money – Answered
You can also recruit Minsc to your party in Baldur’s Gate 3, but you need to meet the requirements, otherwise, there is no chance for recruitment to work.
How to Recruit Minsc in Baldur’s Gate 3
You need to have Jaheira in your party each time you encounter Minsc if you want to recruit him. During the quest, there will be a doppelganger of Jaheira that has coaxed Minsc into serving the Absolute. In my playthrough, Jaheira was dead and there was no way to convince Minsc that the doppelganger was a fraud.

When you have Jaheira in your party, everyone can clearly see that there are some mind games going on. But she will know best, and you need her as part of your party if you hope to gain Minsc as a companion in the battle to come.
For more perspective on the subject, find out if you should save Minsc or not in Baldur’s Gate 3.