Climate change is predicted to raise global soil temperatures by 4.5 ± 1.1°C within the 21st century. Tropical soil warming has been shown to cause free-living soil microbial community shifts towards thermophilic taxa, decreases in microbial diversity, and increases in soil CO2 efflux. The lowland tropical rainforest of Barro Colorado Island (BCI) in Panama contains many species of nitrogen-fixing understory trees that form symbioses with these soil microbes to produce bioavailable nitrogen (N). Potential influences of warming on rhizosphere communities are not well understood. To investigate this, plants were grown on BCI utilizing the SWELTR soil warming infrastructure. Following seven years of below-ground soil warming (30°C), DNA extractions and 16S/ITS illumina sequencing were carried out on rhizosphere and free-living soil samples. 16S analysis revealed that warming significantly impacted the bacterial composition in P.pittieri (non-fixer) rhizospheres, as well as in the free-living soil communities. A small significant difference was also found between the composition of warmed n-fixing rhizosphere and free-living bacterial communities. However there was no significant difference in composition between the unwarmed free-living and warmed rhizosphere n-fixing communities, suggesting the plants may buffer their bacterial rhizosphere communities from warming. ITS analysis revealed warming caused decreases in richness of rhizosphere fungal communities in all plant species, as well as in free-living fungal communities. Warming caused changes in the composition of fungal rhizosphere communities in all plant species and in free-living communities. These findings suggest that fungal communities in soil may be more susceptible to change than bacterial communities under warming.