Ona Mašiotienė née Brazauskaitė (Polish: Anna Brzozowska; 9 September 1883 – 29 December 1949) was a Lithuanian teacher and principal, women's rights activist and writer.

Pressing for both women's rights and Lithuania's independence, she served as a member of different societies and a delegate to several political conferences and assemblies.

Recognized by the independent Lithuanian government with national awards, she was dismissed from her teaching post after the Soviets reestablished authority over the country.

Ona Brazauskaitė was born on 9 September 1883 in the village of Šlavėnai [lt] in the Anykščiai Parish of the Russian Empire to Jadwiga (née Michalowska, also known as Jadvyga Mikalauskaitė) and Gustavas Brazauskas (Gustaw Brzezowski).

[2] While she was studying, she helped establish the Lithuanian Student Society of Moscow and became interested in the women's movements ongoing in Western Europe.

[4] Between 1911 and 1914, Mašiotienė worked as a high school teacher in Vilnius, but with the advent of World War I the young family fled to Moscow.

[4] In 1921, as a board member of the Lithuanian Women's Union, Mašiotienė was elected to serve on the Utena regional council,[2] which was the county in which her estate in the village of Šlavėnai was located.

For the remaining part of the year, Mašiotienė and her family lived in Kaunas, where she taught natural sciences in the areas' secondary schools.

[2] Mašiotienė became involved in a children's health initiative called Pieno lašas (milk drop) and began hosting radio shows in 1930.

The first one, which focused on household tips and health issues was billed as The Conversations of Ann and Marian (Lithuanian: Onos ir Marijonos pasikalbėjimai).