The electrical resistivity of recrystallized, pure β-zirconium at temperatures between 900 and 1700°C as well as the resistivity of β-zirconium-oxygen solid solutions at temperatures between 1100 and 1700°C have been measured. It has been found that the resistivity increases linearly with temperature at a constant oxygen concentration and increases linearly with the oxygen concentration at a constant temperature. The supplementary resistivity Δρ/Δƒ caused by the dissolution of oxygen decreases linearly with increasing temperature, i.e. Matthiessen's rule is not obeyed. The temperature ( T) and oxygen concentration (ƒ) dependence of the electrical resistivity ρ of β-zirconium-oxygen solid solutions at temperatures between 1100 and 1700°C can be represented by the relation ρ = 91.9 + 2.30 × 10 −2 T + 10 2 f(3.75 − 1.03 × 10 −3 T) with ρ in μΩ · cm, ƒ in atomic ratio n O / n Zr and T in °C. Taking these results and literature data into consideration, a survey of the electrical resistivity of zirconium-oxygen solid solutions, including the α-range, is given.