JMHS may refer to:

• Jackson Memorial High School, Jackson, New Jersey, United States
• James Madison High School (disambiguation)
• James Meehan High School, Macquarie Fields, New South Wales, Australia
• James Monroe High School (disambiguation)
• John Maland High School, Devon, Alberta, Canada
• John Marshall High School (disambiguation)
• John Muir High School (Pasadena, California), United States
• Jordan-Matthews High School, Siler City, North Carolina, United States

• Optimally
• Optimal packing
• Optimal portfolio
• Optimal scale
• Optimal sorting
• Optimax
• Optimin
• Optimisation (disambiguation)
• Optimism
• Optimistic decompression
• Optimisticheskaya tragediya
• Optimistic knowledge gradient
• Optimistic (Skeeter Davis song)
• Optimist World Championships
• Optimization
• Optimization disambiguation
• Optimization (mathematics)
• Optimization mechanism
• Optimization Programming Language
• Optimization Toolbox
• Optimize Capital Markets
• Optimized Athlete
• Optimized Consumer Intensity (OCI) Analysis
• Optimized link-state routing protocol
• Optimized Power Control