RSN

The initials RSN may refer to:


 * "Real Soon Now"
 * Regional sports network
 * Renal Support Network
 * Republic of Singapore Navy
 * Resort Sports Network
 * Robust Security Network in IEEE 802.11i-2004 (WPA2)
 * Royal School of Needlework
 * Royal Saudi Navy
 * RSN Racing & Sport

RSn may refer to:
 * Organotin chemistry and related compounds