RSMG may refer to:

• Russell Simmons Music Group
• 16S rRNA (guanine527-N7)-methyltransferase, an enzyme

• Composite theorem
• Composite variety
• Composite video
• Composite video input
• Composite video signal
• Composite volcano
• Compositing
• Compositing (democracy)
• Composition
• Composition-4
• Composition 4
• Compositional data
• Compositionality
• Compositional semantics
• Compositional technique
• Composition B
• Composition book
• Composition books
• Composition C
• Composition chess
• Composition (combinatorics)
• Composition (disambiguation)
• Composition function
• Composition (functions)
• Composition in object-oriented programming