The purpose of this systematic review was to determine the effectiveness of conservative treatments for lateral epicondylitis and to provide recommendations based on this evidence. Five reviewers searched computerized bibliographic databases for articles on the conservative treatment of lateral epicondylitis from the years 1983 to 2003. A total of 209 studies were located; however, only 31 of these met the study inclusion criteria. Each of the articles was randomly allocated to reviewers and critically appraised using a structured critical appraisal tool with 23 items. Treatment recommendations were based on this rating and Sackett's Level of Evidence. This review has determined, with at least level 2b evidence, that a number of treatments, including acupuncture, exercise therapy, manipulations and mobilizations, ultrasound, phonophoresis, Rebox, and ionization with diclofenac all show positive effects in the reduction of pain or improvement in function for patients with lateral epicondylitis. There is also at least level 2b evidence showing laser therapy and pulsed electromagnetic field therapy to be ineffective in the management of this condition. Practitioners should use the treatment techniques that have strongest evidence and ensure that studies findings are generalized to patients who are similar to those reported in primary research studies in terms of patient demographics and injury presentation.