Hamilton Boys' High School is a boys' secondary school in Hamilton, New Zealand and is the largest secondary school in the Waikato region. The school was established as Hamilton High School in 1911 but was later split into separate boys' and girls' schools Hamilton Girls' High School, with the current school opened in February 1955. The school crest features a lion, sash and star, and bears the motto "Sapiens Fortunam Fingit Sibi" which translates to "a wise man carves his own fortune". The school colours are black and red.

Most of the school's approximately 2300 students are day boys from Hamilton and surrounding townships such as Cambridge, Te Awamutu, and Morrinsville. Around 130 boys are housed in an onsite boarding hostel, Argyle House, which forms one of the six houses into which the school is divided. The boarding house is located on the school grounds, but is essentially a private institution, with students paying approximately $12,000 per year to attend

In 1999, the school appointed Susan Hassall to head the school. In doing so the school became one of the first boys' schools in New Zealand to appoint a female headmaster.