After more than a century and twenty-one years since its establishment by a British medical officer on the warship HMS Orion, Dr William T Kensett, MBSSKL has been awarded a cluster school by the Ministry of Education.

In July 1897, he had the intention of establishing a church and school for the Tamil community in Kuala Lumpur and he left the British Navy.

In 1904, the school decided to move to Petaling Hill (its present site) after several relocations by the sanitary board due to the dilapidated condition of the building.

[2] In 1954, 1st Kuala Lumpur Boys' Brigade Company was established at the school by Mr. Khoo Oon Soo and Mr. R. A. Allen.

1st KL is known due to its history in the results of band competitions, foot marches and Talent Time at the national level.

[3] Founded by Mr. Khoo Onn Soo and Mr. R. A. Allen under the sponsorship of Wesley Methodist Church, Kuala Lumpur in 1954.

[4] KLN6ACD is a division under St. John Ambulance of Malaysia, part of an international voluntary service organisation dedicated to training and providing first aid skills.

Lembaga Koperasi Sekolah Co-operator (Informal) Silver Background + Black Lettering (Badge on Left Corner) Co-operator (Formal) Metal, Gold Background with Black Lettering (Badge on Left Corner) :

Lembaga SPBT {SPBT - Skim Pinjaman Buku Teks} Gold Background with Black Lettering Metal, Gold Background with Black Lettering: "EXECUTIVE COMMITTEE", "POSITION" Lembaga Elektronik Metal, Silver Background + Black Lettering (Badge on Left Corner): "EXECUTIVE COMMITTEE","POSITION" Lembaga COMBI {Communication for Behavioural Impact} Metal, Silver Background + Black Lettering (Badge on Left Corner): "EXECUTIVE COMMITTEE","POSITION" Lembaga PRS {Pembimbing Rakan Sebaya} Plastic, Yellow Background + Black Lettering: "EXECUTIVE COMMITTEE","POSITION" The alumni association of MBSSKL is known as MBSalumni, previously known as MBSOBA (Methodist Boys' School Old Boys Association).