<p align="center"><strong><em>ABSTRACT</em></strong></p><p><em>The purpose of this </em><em>research</em><em> was to determine and analyze the effect of Perce</em><em>ived</em><em> Ease of Use, </em><em>E-</em><em>Service Quality, and Trust on Online Purchas</em><em>e</em><em> Decisions on Tokopedia Marketplace consumers in Special Region of Yogyakarta. </em><em>This research using 100 consumers of Tokopedia Marketplace in Special Region of Yogyakarta as samples and</em><em> using purposive sampling technique. The results of this study indicate that: Perce</em><em>ived</em><em> Ease of Use, </em><em>E-</em><em>Service Quality, and Trust together have a positive and significant effect on Online Purchas</em><em>e</em><em> Decisions, Perce</em><em>ived</em><em> Ease of Use </em><em>has</em><em> a positive and significant effect on Online Purchas</em><em>e</em><em> Decisions, </em><em>E-</em><em>Service Quality has a positive and significant effect on Online Purchas</em><em>e Decisions</em><em>, Trust has a positive and significant effect on Online Purchas</em><em>e</em><em> Decisions. The three independent variables are able to influence Online Purchase Decisions on Tokopedia Marketplace consumers in Special Region of Yogyakarta by 71.8% and the remaining 28.2% are influenced by other variables outside of this research model.</em><em></em></p><p><strong><em>Keywords:</em></strong><em> Perceived Ease of Use</em><em>; E-</em><em>Service Quality</em><em>; </em><em>Trust</em><em>; </em><em>Online Purchase Decisions</em><em>; </em><em>Tokopedia Marketplace.</em><em></em></p>