feb 6, 1918 - The United Kingdom
The Representation of the People Act granted women over 30 the right to vote, as long as they were married to or a member of Local Government Register. About 8.4 million women gained the vote. Women were granted suffrage equal to men in 1928 under the Representation of the People (Equal Franchise Act) 1928.
Added to timeline:
Women's Suffrage Timeline