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Tribological behavior of the model AlCoCrFeNi_2.1 eutectic high-entropy alloy (EHEA) sliding against different counterfaces including Al₂O₃, Si₃N₄, SiC ceramics and GCr15 steel at room temperature (RT), and particularly SiC at elevated temperatures were investigated. Our EHEA was found to maintain high hardness (>197 HV) up to 900 °C. The RT tribology tests show that the friction and wear of the EHEA are slightest when against SiC. The wear rates of the EHEA increases monotonously from RT to 900 °C, but the friction coefficient drops sharply (<0.35) when the temperature exceeds 600 °C. This is attributed to the enhancing in the oxidative wear and the formation of deformed fine-grained layer beneath the worn surface.