Alastair Arthur Windsor, 2nd Duke of Connaught and Strathearn (9 August 1914 – 26 April 1943), was a member of the British Royal Family. He was the only child of Prince Arthur of Connaught and Princess Alexandra, 2nd Duchess of Fife. He was a great-grandson of Queen Victoria through his father and also her great-great-grandson through his mother.

In 1942, he became the second Duke of Connaught and Strathearn and Earl of Sussex when he inherited his grandfather's title. In 1943, at the age of 28, he died in Canada of exposure, after falling out of a window in a state of inebriation.

Alastair was born on 9 August 1914 at his parents' home at 54 Mount Street, Mayfair, London (now the Brazilian Embassy). His father was Prince Arthur of Connaught, the only son of Prince Arthur, Duke of Connaught and Strathearn, and Princess Louise Margaret of Prussia. His mother was Princess Alexandra, 2nd Duchess of Fife, the eldest daughter of Alexander Duff, 1st Duke of Fife, and Louise, Princess Royal. As a great grandchild of Queen Victoria through the male line, Alastair was styled His Highness Prince Alastair of Connaught at birth.

The Prince was baptised at his parents' home and his godparents were King George V (his maternal great-uncle), King Alfonso XIII of Spain (for whom Lord Farquhar, a Lord in Waiting to King George, stood proxy), Queen Alexandra (his maternal great-grandmother), the Duke of Connaught (his grandfather, for whom Major Malcolm Murray stood proxy), Princess Louise, Duchess of Argyll (his great aunt), and Princess Mary (his cousin).

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