Lexical Analysis of English Language Used in Documents of Federal Secretariat of Pakistan This quantitative study aims to analyze lexis of English language used in the documents of the federal government. The purpose of this study is to describe the lexical variation of English language and determine how different it is from the ordinary use of English language. The theoretical framework for this study is English for Specific Purposes, with an emphasis on the need of incorporation of office language in the conventional pedagogy at academia as well as to the professionals belonging to this particular workplace. The methodological framework to determine the validity of the hypothesis and answer the research questions of this study is Corpus Linguistics, which is development of collection of texts in real world and natural occurrence. This methodology is used to determine the particular linguistic characteristics of language variation at a particular field. A specialized corpus was compiled from randomly selected documents published by different departments of federal government belonging to administrative and legal genres. The analysis of the corpus focused on three objectives; i). Generation of a wordlist of most frequent words in the corpus that are outside the General Service List and the Academic Wordlist, ii). Identification of collocations or word clustering with higher PMI, and iii). Spelling variations in the lexis.