[영문]This study has four aims. Firstly, the study presents comparative evidence on the presence of foreign affiliatesacross OECD countries. Secondly, it reports the relative labour productivity of foreign affiliates across OECDcountries. Thirdly, the study quantifies the contribution of foreign affiliates to labour productivity growth inOECD countries using a growth accounting approach. Fourthly, the analysis shows how much of this contributionderives from an increase in the employment share of foreign affiliates and how much from an increasein the productivity of foreign affiliates in the host country. The information is derived by matching threeOECD data sources: the STAN database for industrial analysis, the AFA (Activities of Foreign Affiliates) andFATS (Foreign Affiliates in Trade and Services) databases. The study confirms that foreign affiliates are morelabour productive than the average domestic firm and shows that this advantage remains after controlling forindustrial composition of the foreign affiliates sector. Finally, the analysis shows that foreign affiliates canmake an important contribution to labour productivity growth. The contribution is largest in the manufacturingsector. In the services sector and in low-tech manufacturing sectors, the largest component of the contributionof foreign affiliates is associated with the increased employment share of foreign affiliates. In medium- andhigh-tech sectors, the contribution is mainly driven by strong labour productivity growth of existing foreignaffiliates. In the United States the contribution in both the manufacturing and the services sectors is consistentlydriven by strong labour productivity growth of existing foreign affiliates.