Cheltenham Ladies' College (CLC) is a private boarding and day school for girls aged 11 or older in Cheltenham, Gloucestershire, England. The school was established in 1853 to provide "a sound academic education for girls". It is also a member of the Headmasters' and Headmistresses' Conference.

The school badge depicts two martlets, inspiration for which was taken from the pigeons of the Cheltenham town coat of arms, above three stars, which are in turn above a daisy, a school symbol.

In 2020, Cheltenham Ladies' College was named Southwest Independent School of the Decade by The Times and The Sunday Times. It is listed in The Schools Index as one of the world's 150 leading schools and one of the top 30 UK senior schools.

The school was founded in 1853 after six individuals, including the Principal and Vice-Principal of Cheltenham College and four other men, decided to create a girls' school that would be similar to Cheltenham College. On 13 February 1854, the first 82 pupils began attending the school, with Annie Procter serving as the school's Principal. In 1858, upon Procter resigning from her position, the Principal's post was taken by Dorothea Beale, a prominent suffragist educator who later founded St Hilda's College, Oxford. Beale, Louisa Lumsden and Frances Dove maintained their strong links with Cheltenham's contemporary, St Leonard's School. Beale was commemorated by a Cheltenham Civic Society blue plaque in 2017. In 1998, it was announced that sixth-form girls at the school would be allowed to wear trousers for the first time.

The school is divided into three divisions, Lower College (KS3), Upper College (KS4) and Sixth Form College (KS5). The school gives pupils a choice in what they study. A range of subject combinations is available to Upper College girls at GCSE, and for Sixth Form girls at A-level or International Baccalaureate (IB). Tutors are full-time academic members of staff and advise girls on matters relating to their academic work and progress, while the Professional Guidance Centre gives advice on career options and university applications. Most pupils go on to continue higher education.

The school's academic results are high, both compared to the national average and within the independent sector. From 2014 to 2017, the school reported that over two thirds of A-level results and approximately 90% of GCSE results were A* or A grades. Since 2015, the school has been the top girls boarding school in the country for IB results for three consecutive years. In 2019, 71% of students scored A*/A for their A-level examinations awhile 90% scored A*/A for GCSE.

The school is made up of around 80% boarders and 20% day girls. Whether boarders or day girls, pupils are part of a junior or senior house and are supervised by a Housemistress and a team of House Staff.

Girls who board live in one of eleven boarding houses. There are six junior houses for 11- to 16-year-olds, and five senior houses for sixth form girls. The junior houses are Farnley Lodge, Glenlee, Sidney Lodge, St. Austin's, St. Helen's, and St. Margaret's. At Sixth Form, all girls move to a senior house. The senior houses are Beale, Cambray, Elizabeth, Roderic and St. Hilda's. Each house is run by a housemistress and several resident staff. The housemistresses have a lighter teaching load with a full-time commitment supervising their boarders.

Junior day girls have their own base in Eversleigh, where the three junior houses, Bellairs, Glengar and St Clare, are located. The senior day girl house, Bayshill, is situated in the main college site.

Over 160 co-curricular activities are available.

The Music and Drama departments offer productions and concerts each year involving all age groups. Over 1,000 individual instrumental lessons take place each week.

In October 2009, Sir Richard Eyre opened the school's new drama building, The Parabola Arts Centre (PAC). The building was built by Foster Wilson Architects and cost over £12.5 million, funded by donations. The school is a major sponsor of the Cheltenham Music, Literature, Jazz and Science Festivals and events are hosted at the centre annually. The PAC building was awarded the RIBA award. In 2010, Sharman Macdonald (Keira Knightley's mother) was commissioned to write the college's play. In 2016, the school also invested in a new recording studio.

In 2018, the school opened a new Health and Fitness Centre.

Sports facilities include a 25-metre six-lane swimming-pool, netball courts, tennis courts, squash courts, AstroTurf fields, lacrosse pitches, a spin studio, two dance studios and two sports halls.

Over 30 sports are offered, and students are encouraged to maintain their fitness and wellbeing through physical exercise. The main sports are Netball, Lacrosse and Hockey in the winter, and Tennis, Swimming and Athletics in the Summer. The school also has a well-established Rowing Club, and Equestrian and Ski teams.

The school is one of the hardest UK private schools to get into, with competition for places at sixth form being "fierce". Entry to Cheltenham Ladies' College is by examination for girls aged 11+, 13+ and 16+ (Sixth Form), as well as occasionally at 12+ and 14+ where only a few students are admitted.

The school was last inspected by the Independent Schools Inspectorate in October 2014. It achieved the grade "Excellent" in all areas.

In the Financial Times' secondary school ranking, Cheltenham Ladies College was placed at no. 14 in 2010 and no. 34 in 2011. The college was the top girls boarding school and 6th overall in UK rankings for the International Baccalaureate Diploma in 2017.

The Tatler School Guide 2018 notes that "confident, resilient, clever girls flourish" at the college. The Good Schools Guide described the school as "a top flight school with strong traditional values and a clear sense of purpose. For the bright and energetic all rounder this school offers an exceptional education that is both broad and deep, with endless opportunities for fun and enrichment along the way."

In 2020, Cheltenham Ladies' College was named South West Independent Secondary School of the Decade by The Times and The Sunday Times. The awards, published in the "Parent Power" schools guide, commend schools that have achieved academic excellence and provided an outstanding education over the previous decade.

As one of the oldest and most prestigious all-girls' boarding schools in the UK, the school has often been referred to as "the girls' Eton". However, the school has worked hard to play down this reputation.

In 2008 BBC Four made a three-part documentary series titled My New Best Friend to emphasise the importance and nature of friendship among children. The first episode tracked the journey of four young girls starting at Cheltenham Ladies' College.

Cheltenham Ladies' College is mentioned in the film St Trinian's (2007) as the previous school of the main character.

• Annie Proctor, 1854–1858
• Dorothea Beale, 1858–1906
• Lilian Faithfull, 1906–1922
• Beatrice Sparks, 1922–1937
• Margaret Popham, 1937–1953
• Joan Tredgold, 1953–1964
• Margaret Hampshire, 1964–1979
• Joan Sadler, 1979–1987
• Enid Castle, 1987–1996
• Vicky Tuck, 1996–2011
• Gwen Byrom, 2011 (Acting)
• Eve Jardine-Young, 2011–present

• Basil Allchin (1878–1957), organist
• Winifred Lily Boys-Smith (1865–1939)
• U. A. Fanthorpe (1929–2009), poet
• Charlotte Laurie (1856–1933), botanist
• Eleanor Mary Reid (1860–1953), palaeobotanist
• Millicent Taylor (1871–1960), chemist, petitioner to the Chemical Society
• Mary Watson (1856–1933), chemist
• Gustav Holst (1874–1934), composer
• Agnes Tschetschulin (1859–1942), composer and violinist

Guild is the association of College's former pupils.

• Cheltenham Ladies' College Official website.
• Profile on the Independent Schools Council website