EROS may refer to: Science and technology Center for Earth Resources Observation and Science, the US national archive of remotely sensed images of the Earth's land surface Encyclopedia of Reagents for Organic Synthesis, containing a description of the use of all reagents in organic chemistry Extremely Reliable Operating System, an operating system developed by The EROS Group, the University of Pennsylvania and Johns Hopkins University Earth Resources Observation Satellite, a series of Israeli commercial Earth observation satellites Event-related optical signal, a brain-scanning signal Other uses Eelam Revolutionary Organisation of Students, a militant Tamil separatist group in Sri Lanka JDT 1650R EROS, a Mini-MAX aircraft See also Eros (disambiguation) ERO (disambiguation)