Siddiq Moidin Koya (29 February 1924 – 25 April 1993) was a Fijian Indian politician, Statesman and Opposition leader. He succeeded to the leadership of the mostly Indo-Fijian National Federation Party (NFP) on the death of the party's founder, A. D. Patel, in October 1969, remaining in this post until 1977. He later served a second term as leader of the NFP, from 1984 to 1987.