ECM may refer to the following:

• Engineering change management
• Equity capital markets
• Error correction model, an econometric model
• European Common Market

• Lenstra's Elliptic curve method for factoring integers
• European Congress of Mathematics
• Equivalent circuit model for Li-ion cells

• Ectomycorrhiza
• Electron cloud model
• Engineered Cellular Magmatics
• Erythema chronicum migrans
• Extracellular matrix

• European Championships Management

• Electrochemical machining
• Electronic contract manufacturing
• Electronic countermeasure
• Electronics contract manufacturing
• Electronically commutated motor
• Energy conservation measure
• Engine control module
• Enterprise content management
• Error correction mode

• East Camberwell railway station, Melbourne
• ECM Records, a record label
• ECM Real Estate Investments, a defunct real estate developer based in Luxembourg
• Edinburgh City Mission, a Christian organization in Scotland
• Editio Critica Maior, a critical edition of the Greek New Testament
• Elektrani na Severna Makedonija (Електрани на Северна Македонија), a power company in North Macedonia
• Energy Corrected Milk, in farming
• Episcopal Conference of Malawi
• Every Child Matters, a UK Government initiative for children
• Every Child Ministries, a Christian charity for African children
• Exceptional case-marking, in linguistics