Abstract: A toilet ventilation system may include a tank configured to fill with water to a threshold level. The system may also include a ventilation manifold having a manifold body, a first cavity defined in the manifold body that opens to an exterior of the manifold body through a first opening, a second cavity defined in the manifold body, where the second cavity is fluidly connected to the first cavity, where the second cavity opens to an exterior of the manifold body through a second opening, and where the second opening is blocked by the water when the tank is filled to the threshold level, and a third cavity defined in the manifold body, where the third cavity is fluidly connected to the second cavity, and where the third cavity opens to an exterior of the manifold body through a third opening.