In The Collection by Harold Pinter, the four characters make pairs with each other to find the truth about a love affair between Stella and Bill in Leeds. In each relationship, we see the way they manipulate truth to their own advantage and the way they use language as a strategy to take a dominant position to control the others. Here, the language to control the relationship is related with the language concept of Gilles Deleuze and Felix Guattari. According to Deleuze, people can construct power structure in the ways of one’s order-words, implicit presuppositions, and speech acts. In the play, Harry and James, who are dominant members of their respective relationships, use language as order-words, as well as verbal assault and physical attack. On the other hand, Bill and Stella take a rather flexible attitude to evade each conflict and they use language to protect themselves by refusing to confirm or deny. While each character takes different attitudes, the main purpose of their language strategy is to control others in the relationship and to gain an advantage over them. Therefore, it can be concluded that The Collection is the play where language can be used as the strategy for power.