Yes, 3I ATLAS can be seen from Earth but only with professional telescopes, not with the naked eye, because it is very faint and distant. 3I ATLAS is an interstellar comet discovered in 2025 by the ATLAS survey, designated as the third interstellar object, and like other interstellar comets it is small, a few kilometers in size, and far away. It is observable by large ground-based telescopes such as those used by NASA, ESA, and observatories in Hawaii and Chile, and by space telescopes, which track its position, brightness, coma, and spectrum for scientific study. Amateur astronomers with large telescopes of 10 inches or more may be able to detect it as a very faint point of light under dark skies when it is near its brightest near perihelion, but it will not be visible to the naked eye like bright comets such as Neowise or Hale-Bopp because it is much smaller and farther. Its brightness is typically around magnitude 18 to 22, far dimmer than the naked eye limit of magnitude 6. The comet will be visible for months as it traverses the inner solar system before leaving on its hyperbolic trajectory back to interstellar space. NASA's JPL Small-Body Database provides ephemeris for tracking. There is no danger, and its passage is a scientific opportunity. Public may see images online from observatories rather than directly. So professional astronomers will see it, but general public will not see it without telescopes.
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