St. Mary's College Kisubi (SMACK) is a private, boarding, middle and high school located in Wakiso District in the Central Region of Uganda.

Their request was laid for consideration by the August Assembly of the White Fathers' General Chapter at Algiers in 1900.

[5] According to a 2018 published report, St. Mary's College Kisubi is the most prestigious school in Uganda, owing to its excellent academic performance and all round nurturing of its students.

The ever growing college, alongside its infrastructural developments, saw the introduction of a number of sports like basketball, football, swimming and hockey.

The SMACK Old Boys’ Association (SMACKOBA), founded in 1918, has been involved in the running of the school in one way or another right from its foundation in the latter half of the 20th century.

Called upon in the 60s, the Old Boys took charge of the c of a circular profile, but because of cost, the current plan was taken up depicting a gallant eagle in flight.

Notable alumni of St. Mary's College Kisubi (Old Smackists) include three Vice Presidents of Uganda, four Prime Ministers of Buganda Kingdom, two Attorney Generals, a Speaker of Parliament, Cabinet ministers, judges, lawyers, entrepreneurs, renown creative artists and distinguished academics.