Ashby School, formerly known as Ashby Grammar School, is a co-educational comprehensive secondary school and sixth form in Ashby-de-la-Zouch, Leicestershire, England. The school is situated in the centre of Ashby on two sites.

Ashby Grammar School, the original boys' school, was founded in 1567 by Henry Hastings, 3rd Earl of Huntingdon. The girls' grammar school opened in 1901. They merged in 1972 and became comprehensive. Ashby School became an academy on 1 October 2012.

Previously an upper school, in September 2022 the school expanded its age range to 11, and became a full secondary school.

Ashby School consists of two main sites, based on Nottingham Road (Blocks A, C, and S) and Leicester Road (Block B). From the 2020 academic year onwards, following Ofsted's safeguarding concerns of students crossing the road between the two sites, Block B became a designated Sixth Form campus. The Nottingham Road site now accommodates years 7-11 exclusively, and was recently extended to accommodate the growing number of students.

In 2019, a new sports pavilion was constructed on site after changing facilities on Range Road burnt down in a suspected arson attack. The new building includes four sets of changing rooms, showers, a performance space, and a small kitchen.

The school provided boarding accommodation for around 70 boys aged 11–19 attending Ashby School, Ivanhoe College and Ashby Church of England School. In 2019, Ofsted gave the boarding school a rating of 'inadequate', stating it was not delivering good help or care to its boarders.

Consequently, boarding provision was removed from the school, and the buildings re-purposed into a sixth form centre with study and dining spaces.

Until 2019, the school had eight houses: Ashe (grey), Bullen (yellow), Crewe (orange), Erdington (red), Ferrers (blue), Gylby (pink), Hastings (green) and Loudoun (purple).