Admiral (Ret.) Siwi Sukma Adji (born 14 May 1962) is a retired admiral of the Indonesian Navy who had served as its chief of staff (, abbreviated KSAL or Kasal) since 23 May 2018 until 20 May 2020, replacing Ade Supandi who was retiring.

Before becoming chief of staff, he had served as the commander-general of the National Armed Forces Academy, Advisor for