A new formulation is presented for the vapor pressure of ice from the triple point to -100 °C based on thermodynamic calculations. Use is made of the definitive experimental value of the vapor pressure of water at its triple point recently obtained by Guildner, Johnson, and Jones. A table is given of the vapor pressure as a function of temperature at 0.1-degree intervals over the range 0 to -100 °C, together with the values of the temperature derivative at 1-degree intervals. The formulation is

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... compared with published experimental measurements and vapor pressure equations. It is estimated that this formulation predicts the vapor pressure of ice with an overall uncertainty that varies from 0.016 percent at the triple point to 0.50 percent at -100 °C. Key words: Clausius-Clapeyron equation; saturation vapor pressure over ice; thermal properties of ice; vapor pressure; vapor pressure at the triple point; vapor pressure of ice; water vapor.