This study examined the complex factors that motivate 547 English as a second language (ESL) learners in Pakistan to learn English. The results showed that no single factor predicted L2 motivation for this population. Instead, their motivation was influenced by an interconnected combination of language learning experience, international orientation, ideal L2 self, and instrumentality. English as an international language had a strong influence on ESL learning for Pakistani learners given their colonial past. The study suggested teachers should focus on attitudinal, situational, and self-related factors to keep students motivated over the long process of L2 learning.