Nina Gladys Sevening (1885–1958) was an English stage actress and singer who played minor comedy roles in a long string of Edwardian musical comedies in London and on tour.

Sevening was born in Westminster, London. Her parents were H. W. Sevening, a German-born commercial clerk, and his English wife Gertrude. She was educated in London and Paris.^[2][3]

Sevening first appeared on stage in December 1894 in The House That Jack Built at the Opera Comique.^{[citation needed]} She later appeared in:

• My Innocent Boy at the Royalty Theatre 1898
• Florodora at the Lyric Theatre 1899^[4]
• The Silver Slipper at the Lyric Theatre 1901^[5]
• A Country Girl at Daly's Theatre 1902^[1][6]
• The Cingalee at Daly's Theatre 1904^[7]
• The Little Michus at Daly's Theatre 1905^[8]
• The Merveilleuses at Daly's Theatre 1906^[9]
• The Geisha at Daly's Theatre 1906^[10]
• The Merry Widow at Daly's Theatre 1907^[11]
• Susannah and Some Others at the Royalty Theatre 1908^[12]
• Marjory Strode at The Playhouse 1908^[13]
• Mid-Channel at St James's Theatre 1909^[14]
• The Great Mrs. Alloway at the Globe Theatre 1909^[15]
• Mid-Channel at the Empire Theatre (New York) 1910
• A Woman's Way, Comedy Theatre 1910
• Grace at the Duke of York's Theatre 1910^[3]
• Passers By at Wyndham's Theatre 1911
• What Every Woman Knows at the Duke of York's Theatre 1911
• Mind the Paint Girl at the Duke of York's Theatre 1912
• The Perplexed Husband at the Empire Theatre (New York) 1912
• Peter Pan at the Duke of York Theatre 1913^[16]
• King's Cup at the Adelphi Theater 1913^[17]
• The Clever Ones at Wyndham's Theatre 1914
• Caroline at the New Theatre 1916
• Trelawny of the 'Wells' at the New Theatre 1917

In 1903, Sevening toured in Three Little Maids. In 1905 she was a replacement player in the role of Gwenny Holden in Lady Madcap.^[18]

She married Victor Charles Hamilton Longstaffe (born 1885) and changed her last name after him.^[1] She retired from the stage in 1917.

There is a memorial to their only son, David John Longstaffe, in Aldeburgh Parish Church in Suffolk, England. David died on 16 September 1945 in Athens, where he was a Captain in the King's Royal Rifle Corps.^[19]

• J. P. Wearing (2013). The London Stage 1900-1909: A Calendar of Productions, Performers, and Personnel. Scarecrow Press. ISBN 978-0-8108-9294-1.