In chemistry:

In computing:

Displaced Moving Average - Used in Technical Analysis

In Materials Science:

Defense Mapping Agency - Predecessor of the National Geospatial-Intelligence Agency

DMA Design - The former name of Rockstar North, a game developer

Delaware Military Academy

Direct memory access (most common)

Dynamic memory allocation

Detroit Music Awards

Doctor of Musical Arts - A postgraduate educational degree

Dimethylamine, an organic compound

Differential mobility analyzer - Instrument for sorting particles according to their diameter due to different electrical mobility

Direct Marketing Association - A trade organization

DMA (Dance Music Authority) - A magazine geared towards the Dance music community, now defunct.

Designers Management Agency - a privately held company representing luxury fashion designers.

Danish Music Awards

Danish Medical Association

Distributed Multipole Analysis

Digital media adapter also called Digital media receiver - In consumer electronics, for use between computers and other equipment (stereos, TVs, etc.)

Dynamic Mechanical Analysis - A thermal analysis technique

Designated Market Area - A synonym for media market

Direct Market Access - Used in financial markets

Dimethylacetamide, an organic solvent

Dimethoxyamphetamine, a psychedelic phenethylamine

Draw by agreement in chess

Dublin Metropolitan Area - a court and police jurisdiction in the Ireland