The objectives of this post-marketing observational study are to assess the safety and effectiveness, as measured by insulin-like growth factor-1 (IGF-1) and growth hormone (GH) levels, of Somatuline® Depot (lanreotide) Injection when administered by a health care professional (HCP), the patient, the patient's partner or parent/guardian as part of their routine acromegaly care. Treatment convenience and acromegaly symptom relief will also be assessed through questionnaires, and demographic and medical history information will be collected.