•
Sudan Revolutionary Front, alliance of armed groups formed in 2011 •
Syria Revolutionaries Front, formed in December 2013 •
Schweizer Radio und Fernsehen, German-language broadcaster in Switzerland •
SRF Limited, an Indian manufacturing company •
SENS Research Foundation, on the medicine of ageing, Mountain View, California, USA •
Supercentenarian Research Foundation, on why supercentenarians live longer than most and why they die •
Sevin Rosen Funds, a Texas-based venture capital firm ==Science and technology==