Many practical turbulent combustion systems operate at pressures higher than atmospheric, and the general trend in many applications is toward higher operating pressures. On the other hand, most detailed experimental data are limited to atmospheric pressure laboratory turbulent flames, such as those discussed in the previous chapter, and relatively little work to date has focused on radiative heat transfer and TRI at elevated pressures. High-pressure specific issues in combustion and radiation heat transfer are first reviewed briefly. This is followed by an example of a modeling study for a high-pressure laminar flame. Many practical combustion systems use fuels that are introduced as a liquid fuel spray, and spray/radiation coupling is discussed next. Finally, recent work in modeling radiative heat transfer in piston engines and in high-speed combustion systems is reviewed in the final two subsections.