Wanja Ronald Ngah (born 12 September 1991) also known as, Ronald Ngah Wanja, is a Cameroonian professional footballer who plays for Kuching City as a striker.
On 21 January 2022, Ronald signed for Malaysia Super League club Kedah Darul Aman. He scored on his Malaysia Super League debut against Sarawak United in a 1-0 away win on 4 March.
On 31 July 2023, Ronald joined Hajer. On 31 January 2024, Ngah joined Jordanian side Al-Faisaly.