Introduction: As reported by the Canadian Institute for Health Information, the rate of child and youth emergency department (ED) visits for mental health complaints increased by 50% between 2007 and 2015. Improving care for these patients has been identified as a major priority of Alberta Health Services As part of a multi-phased approach to improving care, the Emergency and the Addiction and Mental Health Strategic Clinical Networks undertook an analysis of administrative data to define incidence in Alberta and changing trends. Methods: The data analyzed included 5 different clinical information systems encompassing the 17 highest volume hospitals in Alberta, from April 2013 to March 2016. Patient encounters were included if the patient was under 25 years of age at the time of visit, and if the encounter included a CEDIS Presenting Complaint and/or an ICD-10 Primary Diagnosis relating to Addiction and/or Mental Health (AMH). A total of 54,810 patient encounters were included. Data was analyzed using descriptive statistics. Sub-group analysis was undertaken based upon age, presenting complaint, and primary diagnosis. Results: The incidence of children and youth presenting to an ED with an AMH complaint and an AMH primary diagnosis increased 22% and 7%, respectively, from 2013/14 to 2015/16. Admissions of patients were constant throughout this period. The largest increase in ED visits occurred among children aged 7-10, with a 60% increase in visits defined by presenting complaint and a 21% increase in primary diagnosis. The second largest increase was in young adults aged 18-21 with a 26% increase defined by presenting complaint, and a 12% increase in primary diagnosis. Analyzed by age group, the largest increase in primary diagnosis between 2013/14 and 2015/16 was seen in Depression/Suicidal/Self Harm with a 667% increase among ages 0-6, and a 79% increase among ages 7-10. The second highest increase was for Anxiety/Situational Crisis with a 223% increase among ages 0-6, and 74% among children aged 7-10. Conclusion: Within Alberta there has been a substantial increase in the incidence of child and youth visits to the ED for issues of mental health and addictions. It is clear is that these changing trends are placing an increased burden on our healthcare system and necessitate strategic planning to ensure the health and wellness of our patients.