Volatile organic compounds (VOCs) play an integral role in climate change and as a carbon source for organisms living in a marine environment. These compounds have many sources, but the impacts of biogenically produced VOCs is not fully known. Phaeodactylum tricornutum was studied under axenic ideal growth conditions to determine the amounts, ranges, and types of VOCs released. Through PTR-TOF/MS, 21 statistically significant compounds were found out of 348 detected m/z+1 values. These compounds included esters, ketones, hydrocarbons, and VOCs known to be used as secondary metabolites by cohabitating bacteria. Understanding The interaction between marine organisms, the environment, and the atmosphere is vital to understanding the carbon cycling events that take place there and how those events fit into the larger question of global climate change.