Preference for arbitration as an option for dispute settlement is steadily on the rise, partly because of its perceived efficacious proceedings and enforceability. In 2020, Tanzania enacted a new legislation on arbitration with a detailed and defined framework, cascading through the entire qualifying process of arbitrators, initiating the arbitration proceedings, enforcement and recognition of foreign arbitral awards. This article analyses the corpus of the new legislation, its pertinent structural features, the gaps, and future prospects. The analysis is predicated on the ramifications of the new arbitration law for investment dispute settlements, particularly, state versus investors disputes, as envisaged under the national investment legislation. It concludes by highlighting several aspects which need to be revisited, such as the independence of arbitrators, duty to refer disputes to arbitration, and determination of arbitration costs. Further, a case is made for amendment of the existing national investment legislation in respect of dispute settlement provisions in order to create a harmonious arbitration regime in Tanzania. Tanzania arbitration law, implications to investment disputes, enforcement of foreign arbitral awards