Abstract: A toilet fixture installation apparatus provides a compact structure for the support, movement, and alignment of toilet bowl fixtures during their installation. The inventive apparatus includes a three-wheeled base structure having a pair of lower frame members connected by a crossmember and defining a base plane, a fixed vertical mast portion carrying a sliding mast elevated by a jack member, a fixed horizontal boom extending from the sliding mast in the direction of the lower frame members, a fixed shoe assembly at the end of the fixed horizontal boom and bearing an outwardly-extending toilet bowl gripping member, an adjustable shoe slidably mounted and selectively fixed on the fixed horizontal boom bearing a toilet bowl gripping member extending in the opposite direction from the fixed shoe toilet bowl gripping member, this adjustable shoe also being vertically adjustable relative to the fixed shoe.