A piezoelectric immunosensor was developed for the determination of citrinin. The piezoelectric immunosensor was fabricated by immobilizing anti-citrinin antibody onto the surface of DTSP-modified electrode. Determination of citrinin based on direct, competitive and enzyme amplified assay formats were evaluated in terms of detection sensitivity. Among them, competitive assay format exhibited the best performance. The immunosensor exhibited a linear working range between 25 and 100 ng/mL. It was observed that the citrinin assay is specific, no significant cross reactivity was observed in the presence of ochratoxin A.