Henry's law constants for dimethysulfide were measured in several natural waters of varying salinity and in distilled water over a range in temperature from 0¿-32¿C. Fitting our data to the equation: 1nH (atm L mol-1) =A/T(¿K)+C yields A=-3463 (75) and -3547 (16), and C=12.20 (0.26) and 12.64 (0.06), for distilled water and seawater respectively (standard errors in parenthesis). These solubilities support the concept that the concentration of dimethylsulfide in the atmosphere is far from equilibrium with seawater.