Mwanga I was Kabaka of the Kingdom of Buganda from 1740 until 1741. He was the twenty third (23rd) Kabaka of Buganda.
He was the eldest son of Prince Musanje Golooba. His mother was Nabulya Naluggwa of the Ndiga clan, the second wife of his father. He ascended to the throne after the death of his uncle, Kabaka Mawanda Sebanakitta, in 1740.
Mwanga I and his brothers were the first Buganda Monarchs to go to Nnagalabi (later to be named Budo) for their coronation ceremonies. Previous Kabakas had gone to Nankere for the final and most important confirmation ceremony.
Some of the great officers of state during his reign included;
He is recorded to have married five (5) wives:
He is recorded to have fathered three (3) sons:
Kabaka Mwanga I Sebanakitta was killed by Nkunnumbi, in revenge for the murder of his son, around 1741. He was initially buried at Meerera. In 1860, his remains were exhumed and re-buried at Kavumba, Busiro. He was succeeded by his brother, Prince Namuggala Kagali.