Tuberculosis (TB) is a still prevalent and important disease entity in Korea. TB can involve any part of the gastrointestinal tract, and intestinal TB is an important disease of extra-pulmonary TB. The diagnosis of intestinal TB remains a challenge because the signs and symptoms are nonspecific. It should be differentiated from the inflammatory bowel diseases and malignancies, especially Crohn's disease. The diagnosis of intestinal TB should be based on careful clinical evaluation, such as extra-intestinal signs, colonoscopic and histologic evaluation. Newer techniques such as PCR method or test for the diagnosis of latent TB (Interferon-gamma assay) may be helpful. In addition, a high index of suspicion must be kept in mind to ensure a timely diagnosis. Herein, IBD Study Group of the KASID proposes a diagnostic guideline based on currently available evidence and experience, especially those of Korea. We also propose the test which may be helpful to establish the proper diagnosis of intestinal TB.