Sithambarampillai Thurairaja, PC (Tamil: சிதம்பரப்பிள்ளை துரைராஜா, romanized: Citamparappiḷḷai Turairājā) is a Sri Lankan lawyer and a sitting Puisne Justice of the Supreme Court of Sri Lanka. He was formerly a Justice of the Court of Appeal of Sri Lanka and High Court of Fiji.