Gold nanoparticles (AuNPs) are commonly used in photothermal treatment in biological media. In these systems, the excitation wavelength is ideal in the near-infrared (NIR) region of the spectrum (650–900 nm) to take advantage of the high penetration depth in cells and tissues. Gold nanospheres (AuNSs) with sizes ranging from about 20–80 nm exhibit plasmon wavelength maxima of approximately 520–550 nm and are generally capable of showing higher magnitudes of absorption cross-section and light scattering. The peak absorption wavelength drawback of spherical AuNPs can be addressed by tuning the localized surface plasmon resonance by shape manipulation during synthesis. Some types of AuNPs that can exhibit plasmon wavelength maximum in the NIR region are gold nanorods (AuNRs) and gold nanotriangles (AuNTs) whose absorption are in the 700–1400 nm. The effect of nanoparticle shape on the photothermal properties of the nanoparticles was investigated in this study. Heat transfer from the heat-generating nanospheres, nanorods, and nanotriangle geometries to the gelatin matrix where the particles are dispersed was simulated in steady state and transient conditions. Results showed comparable heat transfer rate between various shapes. Thus, the localized surface plasmon resonance (LSPR) nanoparticle shape-dependence of heat transfer rate is shown to be minimal in photothermal applications.