Isabel Marion Seymour (born 1882) was a UK suffragette who was employed by the Women's Social and Political Union.

She was introduced to the Women's Social and Political Union by her friends Frederick and Emmeline Pethick Lawrence.

[3] She was a confident speaker in English and German and she went on a speaking tour in Germany and Russia on behalf of the WSPU.

They supported their daughter Mary Blathwayt and the other WSPU members by providing accommodation for recovering suffragette's.

[4] She later moved to Canada for eight years but she returned to the UK where she became a county councillor for Hampshire.