Jangsan may refer to:

• Jangsan (Busan), a mountain in the South Korean city of Busan
• Jangsan (Gangwon), a mountain in the South Korean province of Gangwon-do
• Jangsan station, a railway station in the South Korean city of Busan

• Activated-leukocyte cell adhesion molecule
• Activated macrophage
• Activated partial thromboplastin
• Activated rhodopsin
• Activated sludge model
• Activated therapy
• Activate My Heart
• Activating transcription factor-1
• Activating transcription factor 1
• Activating transcription factor 2
• Activating transcription factor 6
• Activating transcription factors
• Activation analysis
• Activation Analysis
• Activation barrier
• Activation fee
• Activation key
• Activation syndrome
• Activation synthesis hypothesis
• Activation-synthesis hypothesis
• Activation synthesis theory
• Activation Synthesis Theory
• Activation threshold
• Activator (disambiguation)
• Activator (phosphor)