In this study, VB2–20 vol% SiC composites with and without 5 vol% WC were prepared via hot-pressing at 1800 °C for dwell time of 1 h under 20 MPa in Ar. Relative densities of >96% were obtained for the two compositions composites. The mechanical properties of the resulting composites were evaluated at the temperatures ranging from room temperature to 1400 °C. The results show that the temperature dependence of the mechanical properties was strongly related to the addition of WC. For VB2–SiC composite without WC, a maximum strength of 585 ± 55 MPa was obtained at 1000 °C, then the strength decreased to 236 ± 11 MPa at 1400 °C, with substantially degradation of strength accompanying increase of temperature. For VB2–SiC–WC composite, on the other hand, the addition of WC enhanced high-temperature strength up to 1400 °C, with strengths in the range of 464–523 MPa. The strength was higher at elevated temperature than at room temperature; and a maximum strength of 523 ± 27 MPa was obtained at 1200 °C. In addition, although at or below 1000 °C the strength was lower for VB2–SiC–WC than for VB2–SiC, above 1000 °C the strength was significantly higher for the former than for the latter.