Rạp Công Nhân, usually translated as the Workers' Theatre or Cong Nhan Theater, sits on Tràng Tiền in Hanoi's French Quarter, close to the Opera House and Hoàn Kiếm Lake. The building is less grand than the Opera House, but it belongs to the same central theatre district and is a practical place to look for Vietnamese drama, music, and staged cultural performances.
For travellers, the value is not just the architecture but the chance to see local stage culture in a venue used by Vietnamese audiences. Programming changes, so check current listings rather than assuming there will be an English-friendly show, but performances such as traditional music, theatre, and ritual-inspired productions have made the venue a useful alternative to the more famous water puppet theatre nearby.