O'Toole is an Irish surname. It may refer to:

Richard St John Harris (1 October 1930 – 25 October 2002) was an Irish actor, singer-songwriter, theatrical producer, film director and writer.

He appeared on stage and in many films, and is perhaps best known for his roles as King Arthur in Camelot (1967), as Oliver Cromwell in Cromwell (1970) and as Albus Dumbledore in the first two films in the Harry Potter series, his final works. He played a British aristocrat and prisoner in A Man Called Horse (1970), Emperor Marcus Aurelius in Gladiator (2000), Saint John in Apocalypse Revelation (2002), gunfighter English Bob in Clint Eastwood's Western film Unforgiven (1992), and Dom Frollo in the 1997 TV movie version of The Hunchback of Notre Dame. Harris had a top ten hit in the UK and the US with his 1968 recording of Jimmy Webb's song "MacArthur Park".

Harris, the fifth of nine children, was born in Limerick city, Ireland (then known as the Irish Free State) into a middle-class, staunchly Roman Catholic family. His parents were Ivan John Harris (b. 1896, son of Richard Harris, b. 1854, son of James Harris of St. Michael's, Limerick) and Mildred Josephine Harty Harris (b. 1898, daughter of James Harty, St. John's, Limerick, who owned a flour mill.) Harris' siblings include Patrick Ivan (born 1929), Noel William Michael (born 1932), Diarmid (Dermot, born 1939), and William George Harris (born 1942). He was schooled by the Jesuits at Crescent College. A talented rugby player, he was on several Munster Junior and Senior Cup teams for Crescent, and played for Garryowen. Harris' athletic career was cut short when he caught tuberculosis in his teens. He remained an ardent fan of the Munster Rugby and Young Munster teams then until his death, and attending many of its matches, and there are numerous stories of japes at rugby matches with the actors and fellow rugby fans Peter O'Toole and Richard Burton.

Peter Seamus Lorcan O'Toole (born 2 August 1932) is an Irish actor of stage and screen. O'Toole achieved stardom in 1962 playing T. E. Lawrence in Lawrence of Arabia, and then went on to become a highly-honoured film and stage actor. He has been nominated for eight Academy Awards, and holds the record for most competitive Academy Award acting nominations without a win. He has won four Golden Globes, a BAFTA, and an Emmy, and was the recipient of an Honorary Academy Award in 2003 for his body of work.

Peter Seamus Lorcan O'Toole was born in 1932. Some sources give his birthplace as Connemara, County Galway, Ireland, and others as Leeds, in the West Riding of Yorkshire, England, where he grew up. O'Toole himself is not certain of his birthplace or date, noting in his autobiography that, while he accepts 2 August as his birthdate, he has a birth certificate from each country, with the Irish one giving a June 1932 birthdate. O'Toole is the son of Constance Jane (née Ferguson), a Scottishnurse, and Patrick Joseph O'Toole, an Irish metal plater, football player and racecourse bookmaker. When O'Toole was one year old, his family began a five-year tour of major racecourse towns in Northern England. He was brought up Roman Catholic. O'Toole was evacuated from Leeds early in World War II and went to a Catholic school for seven or eight years, where he was "implored" to become right-handed. “I used to be scared stiff of the nuns: their whole denial of womanhood – the black dresses and the shaving of the hair – was so horrible, so terrifying,” he later commented. “Of course, that's all been stopped. They're sipping gin and tonic in the Dublin pubs now, and a couple of them flashed their pretty ankles at me just the other day.”

Munster Rugby, usually referred to simply as Munster, is one of the four professional provincial rugby teams from Ireland. They compete in the RaboDirect Pro12 and the Heineken Cup. The team represents the IRFU Munster Branch, which is one of four primary branches of the IRFU and is responsible for rugby union in the Irish province of Munster. Their main home ground is Thomond Park, Limerick, though some smaller profile games are played at Musgrave Park, Cork. Munster currently play in a red and blue home strip, while the away strip is white striped horizontally with the colours of the six counties of Munster. The Munster Rugby logo consists of three crowns and a stag. The team motto is "To the brave and faithful, nothing is impossible"; it is derived from the motto of the MacCarthy clan – "Forti et Fideli nihil difficile".

Munster is known for its passionate support and games involving Munster hold several Heineken Cup records for highest attendances in every stage of the finals, as well as the highest ever attendance for a rugby game in both Spain and Switzerland. In 2008, Director of Coaching Declan Kidney left to take up the head coach job with Ireland, and Munster ensured continuity by promoting Australian Tony McGahan to the position from within the coaching setup.

Michael O'Toole is an Irish guitarist.

He studied for many years with John Feeley in the DIT Conservatory of Music and Drama and also spent two years studying with the renowned Cuban virtuoso Ricardo Iznaola in Denver, Colorado. He has since established himself as one of Ireland's leading guitarists, giving many memorable recitals and becoming Artistic Director of both The Waltons International Guitar Festival and the "Chord" Ennis International Music Festival. O'Toole is also on the board of directors of the prestigious Kilkenny Arts Festival.

O'Toole has performed extensively throughout Ireland, America and the United Kingdom, and has performed live several times on national radio and television, including a live broadcast of Rodrigo's Concerto de Aranjuez on RTÉ lyric fm with the RTÉ Concert Orchestra. His commitment to contemporary music and to the expansion of the guitar repertoire has led him to work with prominent Irish composers such as Eric Sweeney, Jerome de Bromhead, David Fennessy and Ian Wilson. He has also performed in ensemble with such groups as the Opera Theatre Company, the RTÉ Concert Orchestra, the Dublin Guitar Quartet and RTÉ National Symphony Orchestra. O'Toole is also on the faculty of The Royal Irish Academy of Music, the Music Department at Waterford Institute of Technology, and also the DIT Conservatory of Music and Drama.