Abstract: A toilet leak containment assembly for preventing water leaks from a toilet during flushing onto the support flooring into which the toilet is attached. The leak containment assembly contains a leak collector for installation between the toilet base and the support flooring for preventing the water leaks onto the support flooring during flushing. The leak collector contains an attachment flange for attaching the leak collector to the support flooring, a collector pan for collecting water leaks during flushing, and an outlet pipe in fluid communication with the collector pan for channeling the leaks into the plumbing drain pipe. It also contains a leak seal assembly for installation and sealing between the toilet base and the leak collector. The leak seal assembly contains a flow channel for channeling water flow into the outlet pipe of the leak collector, and a seal for sealing between the toilet base and the leak collector.