BACKGROUND: Leg ulceration is a common, chronic, recurring condition. The estimated prevalence of leg ulcers in the UK population is 1.5 to 3 per 1000. Venous ulcers (also called stasis or varicose ulcers) comprise 80% to 85% of all leg ulcers. Electromagnetic therapy (EMT) is sometimes used as a treatment to assist the healing of chronic wounds such as venous leg ulcers. OBJECTIVES: To assess the effects of EMT on the healing of venous leg ulcers. SEARCH METHODS: For this third update, we searched The Cochrane Wounds Group Specialised Register (searched 12 November 2012); The Cochrane Central Register of Controlled Trials (CENTRAL) (The Cochrane Library 2012, Issue 10); Ovid MEDLINE (2011 to November Week 1 2012); Ovid MEDLINE (In-Process & Other Non-Indexed Citations, November 12, 2012); Ovid EMBASE (2011 to 2012 Week 45); and EBSCO CINAHL (2011 to 9 November 2012). SELECTION CRITERIA: Randomised controlled trials comparing EMT with sham-EMT or other treatments. DATA COLLECTION AND ANALYSIS: At least two review authors independently scrutinised search results and obtained full reports of potentially eligible studies for further assessment. We extracted and summarised details of eligible studies using a data extraction sheet, and made attempts to obtain missing data by contacting study authors. A second review author checked data extraction, and we resolved disagreements after discussion between review authors. MAIN RESULTS: Three randomised controlled trials (RCTs) of variable quality involving 94 people were included in the original review; subsequent updates have identified no new trials. All the trials compared the use of EMT with sham-EMT. In the two trials that reported healing rates; one small trial (44 participants) reported that significantly more ulcers healed in the EMT group than the sham-EMT group however this result was not robust to different assumptions about the outcomes of participants who were lost to follow up. The second trial that reported numbers of ulcers healed found no significant difference in healing. The third trial was also small (31 participants) and reported significantly greater reductions in ulcer size in the EMT group however this result may have been influenced by differences in the prognostic profiles of the treatment groups. AUTHORS' CONCLUSIONS: There is no high quality evidence that electromagnetic therapy increases the rate of healing of venous leg ulcers, and further research is needed.