In many cases, yes, a dehumidifier will help reduce condensation. Dehumidifiers work by drawing in humid air, removing moisture from it, and then circulating the drier air back into the room. This process helps to balance humidity levels and reduce excess moisture in the air.
With that said, dehumidifiers aren’t always 100% effective at preventing condensation. Factors such as temperature differences between indoor and outdoor environments, window quality, insulation, and ventilation also play a role, so it’s a good idea to combine the use of a dehumidifier with other preventive measures, such as an effective ventilation system.