Former Maris Stella High principal Anthony Tan Kim Hock has been found guilty of embezzling about $67,700 from the school.
Tan, 65, faced 21 charges of criminal breach of trust between 2004 and 2009 but the prosecution proceeded only on one count involving the misappropriation of $67, 679.05.
Tan was found guilty of using school funds for a project to rebuild Champagnat House, a three-storey private residence of the Marist Brothers, a religious order which Tan belonged to.
District Judge Soh Tze Bian said that the prosecution had proved beyond reasonable doubt that the former principal is guilty after an 11-day trial. He is expected to be sentenced on June 28.