This chapter provides a detailed account of the evolution of seismic design provisions in Canadian codes and standards, with a primary focus on the National Building Code of Canada (NBCC) and its referenced design standards, CSA A23.3 for concrete and CSA S16 for steel structures. Beginning with the early era of seismic design in Canada, the chapter traces the development of force calculation methodologies, including the equivalent static force procedure and dynamic procedures, as well as critical design considerations such as higher mode effects, torsional response, vertical and horizontal distribution of seismic forces, and structural irregularities. The chapter also examines the codification of deflection control, load combinations, and seismic detailing requirements for both reinforced concrete and steel systems. By documenting the historical progression from empirical approaches to modern performance-based frameworks, the chapter offers valuable insights into how seismic design in Canada has advanced in response to evolving hazard models, international practice, and structural resilience objectives.