Infiltration may refer to: Infiltration (HVAC), a heating, ventilation, and air conditioning (HVAC) term for air leakage into buildings Infiltration (hydrology), downward movement of water through soil Infiltration (medical), the diffusion or accumulation of substances not normal to it or in amounts in excess of the normal Infiltration (zine), a popular urban exploration zine/website created by Jeff Chapman (a.k.a. Ninjalicious) InfiltrationMod, a tactical shooter game Infiltration tactics… (More on Infiltration)