Emily Caroline Langton Massingberd (19 December 1847 – 28 January 1897), known as Emily Langton Langton from 1867 to 1887, was an English women's rights campaigner and temperance activist.

Her husband, Edmund Langton, died in 1875. In 1877, Emily built and lived in the Red House in Bournemouth. Since the 1940s, the house has often been erroneously associated with Lillie Langtry and Bertie, the Prince of Wales. Upon her father's death in 1887, she inherited Gunby Hall.

In 1892, she founded the Pioneer Club, with the object of the political and moral advancement of women. It was one of the first, and one of the most powerful and well known, of progressive women's clubs in the UK, and was particularly influential while she remained alive.

Her birth surname was Massingberd, and her married surname was Langton. After her father's death, she re-assumed the surname Massingberd by royal licence on 20 May 1887, and went by "Mrs. Massingberd" rather than "Mrs. Langton".

Emily Massingberd was born Emily Caroline Langton Massingberd on 19 December 1847 in East Stonehouse, Devon. She was the eldest daughter of Charles Langton Massingberd of Gunby Hall and Harriet Anne Langford.

She married her second cousin, Edmund Langton, in 1867. Edmund was the son of Rev. Charles Langton and Charles Darwin's sister-in-law Charlotte Wedgwood Langton. After Charlotte died Rev. Langton married Darwin's sister Emily Catherine Darwin in 1863.

Emily and Edmund had four children, a son and three daughters: Charlotte Mildred (1868–1941), Stephen (1869–1925), Mary (1871–1950), and Diana (1872–1963).

Her husband Edmund died, aged 34, in November 1875, at Eastwood, East Cliffe Road, Bournemouth, the home of his father Rev. Charles Langton.