Today, English has emerged as an important means of communication across the world including Pakistan. In Pakistan, it enjoys the status of second language as it is offered as a compulsory subject from primary level up to higher classes. In addition, there is great need and demand for having a sound grasp over English language to encounter professional challenges. However, Pakistani learners still face various problems while speaking and writing English. This study examined the abuse of English prepositions by Pakistani learners. It focused on the types of prepositional errors found in their English writing. Moreover, the study investigated whether male learners committed more preposition errors or female. For this purpose, twenty six (26) students of HSSC (thirteen participants from each gender) were chosen through systematic random sampling under Quantitative research paradigm. The data were collected through composition test and essay writing which were then analyzed through tables and graphics. Consequently, the study found out various types of prepositional errors in the participants’ writing. Besides, the study showed higher ratio of errors in female participants’ writing than the males’. At the end of the study, some recommendations were given as how to lessen the ratio of English preposition errors in Pakistani learners’ writing.