Strategic Focus, shortened to Stratfor, is an antagonistic group found in Steins;Gate Zero that takes up a role analogous to that of SERN in the original story. They are a private intelligence agency nicknamed the "Shadow CIA" by conspiracy theorists, and are well-renowned among them for their crucial and under-documented role in recent world politics, most notably the Gulf and Iraq wars.
Stratfor's existence is unknown throughout most of the story, and depending on the route taken by the player in the visual novel, they are revealed to either be after Kagari Shiina for her ability to receive or her already received copy of Makise Kurisu's memories - or after patients of "New Encephalitis" which is actually widespread Reading Steiner. Both operations are revealed to be led by Dr. Alexis Leskinen, and both aim to reconstruct a working time travel theory and sell it to the whole world, which eventually results in the Third World War.
Much like SERN is an orthographical modification of the real-world CERN, Strategic Focus' real name is Strategic Forecasting hence the short name "Stratfor". In Japanese, the latter is pronounced "Suturatofou", the R being silent, which allows "Focus" and "Forecasting" to be mixed.