Septimus Drummond Lambert (3 August 1876 – 21 April 1959)^[1] was an Irish cricketer. A right-handed batsman and wicket-keeper,^[1] he played 14 times for the Ireland cricket team between 1896 and 1921,^[2] including seven first-class matches.^[3]

Lambert was educated at Rathmines School and Wesley College in Dublin and at St John's College in Preston before qualifying as a solicitor in Dublin.

Sep Lambert made his debut for Ireland against I Zingari in August 1896. Never a regular in the Irish side, his international career contains several large gaps between matches, and it was three years before he played his second match for Ireland, also against I Zingari in August 1899. Another three-year gap followed,^[2] before he made his first-class debut for Ireland, against London County in May 1902,^[3] in what was also Ireland's first first-class match.^[4] This was a rare period of consistent selection for Ireland,^[2] and he played three further first-class matches again that month, against the MCC, Oxford University and Cambridge University.^[3]

He played once in 1903 against London County, and twice in 1904 against South Africa and Cambridge University. He played a match against HDG Leveson-Gower's XI in 1905, before another gap in appearances, this time for eleven years, returning for a match against Scotland in July 1911.^[2]

Another long gap followed, though much of this can be explained by Ireland not playing between 1915 and 1919 due to the First World War.^[4] He did play three more times for Ireland though, against Scotland in 1920 and against the Irish Military and Scotland in 1921.^[2]

His parents were Kate (née Barrett) and Thomas Drummond Lambert.^[5] Sep Lambert came from a cricketing family. His brother Bob was one of Ireland's finest cricketers, and his nephew Ham also played cricket for Ireland.^[1]