The effect of Al and Si on microstructure evolution, mechanical, magnetic properties, and electrical resistivity of non-equimolar Fe 2 CoNi(AlSi) x ( x  = 0–0.4) high-entropy alloys (HEAs) was studied. This series of Fe 2 CoNi(AlSi) x HEAs has a dual-phase structure and shows an excellent combination of mechanical and soft magnetic properties. In particular, the Fe 2 CoNi(AlSi) 0.4 HEA exhibits high compressive yield strength σ 0.2 (887.6 MPa), fracture strain (39%), electrical resistivity ρ (84.8 μΩ cm), M s (155.2 emu/g), and H c (1.7 Oe). This work may provide a promising method of developing HEAs with an optimal balance of mechanical and soft magnetic properties under the addition of Al and Si suitable for wide-range industrial applications.