Today information technology has become integral part of every kind of business. Organizations often need experts who have great insights in solving their business problems through information technology. This has led to development of a new field: information technology consulting (or IT consulting). This field has matured quite well in last 20 years. This study is an attempt to identify major focus of IT consulting practices and the challenges associated with them. 123 peer-reviewed academic research papers in field of IT consulting were considered for this systematic literature review. After filtering these papers, eventually 36 papers were selected. A number of major focus of IT consulting in last 20 years and challenges associated with them were identified (Education/IT Training, Auditing, Project Management, Knowledge Transfer, IT Economics, Security, Competitiveness, Applications). This review paper provides valuable information for business executives who are seeking to use IT practices for their business problems. It also provides directions for future research in IT consulting.