Nanosized particles of La 1−x Dy x Fe 1−y Mn y O 3 were prepared by normal micro-emulsion method involving simultaneous double ions substitution. The particles diameter was found in the range of 11–60nm as confirmed by X-ray diffraction and scanning electron microscopy analysis. The saturation magnetization (M s ) was improved from 4.62×10 3 Am −1 to 7.38×10 3 Am −1 , the retentivity (M r ) was increased from 692Am −1 to 3737.75Am −1 while the coercivity was decreased from 4.42×10 3 Oe to 3.35×10 3 Oe as determined by hysteresis loops measurement. The maximum M s and M r values were exhibited by La 0.25 Dy 0.75 Fe 0.25 Mn 0.75 O 3. The electrical resistivity of La 1−x Dy x Fe 1−y Mn y O 3 was increased from 1.65×10 8 Ωcm (La 1.0 Dy 0.0 Fe 1.0 Mn 0 O 3 ) to 18.79×10 8 Ωcm (La 0.5 Dy 0.5 Fe 0.5 Mn 0.5 O 3 ). The significant improvement in dielectric properties of La 1−x Dy x Fe 1−y Mn y O 3 was also observed and maximum dielectric properties (dielectric constant, dielectric loss and dielectric loss factor) were exhibited by La 0.5 Dy 0.5 Fe 0.5 Mn 0.5 O 3, which is compatible with the electrical properties.