The objective of this paper is to provide description of international best practices on supporting startup ecosystems. The paper is divided into four parts. After this introductory chapter, the second chapter explains the elements and characteristics of startup ecosystems. The third chapter describes some common policies and instruments which are used to support startups and startup ecosystems. The fourth chapter presents selected international examples of startup ecosystem policies and initiatives. The fifth chapter synthesizes the findings from these comparisons and discusses how the results, findings and lessons could be utilized when designing support policies for startup ecosystems. This part is written with a particular emphasis of Vietnamese policy planning and the new SME law under preparation.