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In the present work, we report a green synthesis of CrFe3O4 nanoparticles using Cucumis sativus peel extract as natural surfactant. The coprecipitation route was explored to produce CrFe2O4 nanoparticles by varying Cucumis sativus composition. The CrFe3O4 nanoparticles were characterized by means of X-ray diffractometer, scanning electron microscopy, and Fourier transform infrared spectroscopy. The results of X-ray diffraction data analysis indicated that the change in the diffraction peak to the higher position was influenced by Cucumis sativus composition. All samples constructed spinel structure in a single phase without any impurity. The scanning electron microscopy images showed that the samples had particles size and morphology in the spherical nanometric size. In general, the particles size and distribution of the particles were contributed by Cucumis sativus peel extract composition as a surfactant. Results of the infra-red data analysis presented that the absorption bands for atomic bonds of O-H at the wavelength of 1379, 1614, and 3479 – 3400 cm-1. C-H bonds appeared in the range of 3000 - 3400 cm-1. Furthermore, Fe-O and Cr-O bonds appeared at the wavelength of 430 – 669 cm-1. Therefore, natural surfactant obtained the from peel extract in this work becomes a new potential candidat to produce magnetic nanoparticles in large scale production.