Appapillai Amirthalingam (Tamil: அப்பாப்பிள்ளை அமிர்தலிங்கம்; Sinhala: අප්පාපිල්ලෙයි අමිර්තලිංගම්; 26 August 1927 – 13 July 1989) was a leading Sri Lankan Tamil politician, Member of Parliament and Leader of the Opposition. Amirthalingam was assassinated by the Tamil Tigers.