SSEC can refer to:
IBM SSEC, an electromechanical calculator in the 1940s Sarnia Sports & Entertainment Centre, Ontario, Canada Secondary Schools Examinations Council, British body 1917-1963 Shri Shankaracharya Engineering College, an engineering college in Chhattisgarh, India Society for the Study of Early Christianity at Macquarie University in Sydney, Australia South Seas Evangelical Church, in the Solomon Islands Space Science and Engineering Center at the University of Wisconsin–Madison, USA SSE Composite Index, Shanghai Stock Exchange index Stepping Stone Educational Centre in Port Harcourt, Rivers State