Szmul Zygielbojm (Polish: ['?mul z?'g??lb?jm]; Yiddish: ????? ?????????; (1895-02-21)21 February 1895, Poland – (1943-05-11)11 May 1943, London) was a Polish Jewish socialist politician, Bundist trade union activist, and a member of the National Council of the Polish government-in-exile.
Zygielbojm was born in 1895 to a working-class family and had to leave school at the age of ten.
In his early twenties, he became involved in Bundist trade union activism.
In 1924, he was elected to Bundist Central Committee.
He edited a Bundist newspaper and was elected to Lódz city council in 1938.
Upon the invasion of Poland he fled to Warsaw and was made briefly a member of the Judenrat.
He fled to the Netherlands and then England, where he was appointed to the National Committee of the Polish government-in-exile.
He interviewed Jan Karski and tried to publicize the news of the mass murder of Jews in Poland.
After the Warsaw Ghetto uprising was brutally crushed and Warsaw's remaining Jews murdered, he committed suicide to protest the indifference and inaction of the Allies.