Abstract: A toilet bowl ventilating apparatus includes a housing secured in cantilever fashion to a mounting arm which is adapted to be mounted to toilet seat mounting bolts of a toilet bowl. The housing has a receptacle for filter medium and a fan to draw air through the housing past the filter medium. The mounting arm is secured substantially symmetrically at a mid-point of the housing and has an outwardly and downwardly extending elongated intake passage that extends down into the toilet bowl. The intake passage is flexibly adjustable over 180 degrees to a selected orientation, thereby enabling the intake passage to change orientation depending upon whether the housing is positioned on the left side or the right side of the toilet bowl.