Lemkin was born Rafał Lemkin on 24 June 1900 in Bezwodne, a village in the Volkovyssky Uyezd of the Grodno Governorate of the Russian Empire (present-day Belarus). He grew up in a Polish Jewish family on a large farm near Wolkowysk and was one of three children born to Józef Lemkin and Bella née Pomeranz. His father was a farmer and his mother an intellectual, painter, linguist, and philosophy student with a large collection of books on literature and history. Lemkin and his two brothers (Eliasz and Samuel) were homeschooled by their mother.

​

After graduating from a local trade school in Białystok Lemkin began the study of linguistics at the Jan Kazimierz University of Lwów (now Lviv, Ukraine). He was a polyglot, fluent in nine languages and reading fourteen. His first published book was a 1926 translation of the Hayim Nahman Bialik novella Noah and Marinka from Hebrew into Polish. It was in Białystok that Lemkin became interested in laws against mass atrocities after learning about the Armenian genocide in the Ottoman Empire, then later the experience of Assyrians massacred in Iraq during the 1933 Simele massacre. He became interested in war crimes upon learning about the 1921 trial of Soghomon Tehlirian for the assassination of Talaat Pasha. 

​

After reading about the 1921 assassination of Talat Pasha, the main perpetrator of the Armenian genocide, in Berlin by Soghomon Tehlirian, Lemkin asked Professor Juliusz Makarewicz why Talat Pasha could not have been tried for his crimes in a German court. Makarewicz, a national-conservative who believed that Jews and Ukrainians should be expelled from Poland if they refused to assimilate, answered that the doctrine of state sovereignty gave governments the right to conduct internal affairs as they saw fit: "Consider the case of a farmer who owns a flock of chickens. He kills them, and this is his business. If you interfere, you are trespassing." Lemkin replied, "But the Armenians are not chickens". His eventual conclusion was that "Sovereignty, I argued, cannot be conceived as the right to kill millions of innocent people". 

Lemkin then moved on to Heidelberg University in Germany to study philosophy, returning to Lwów to study law in 1926

​

After II Warld war, Lemkin chose to remain in the United States. Starting in 1948, he gave lectures on criminal law at Yale University. In 1955, he became a Professor of Law at Rutgers School of Law in Newark. Lemkin also continued his campaign for international laws defining and forbidding genocide, which he had championed ever since the Madrid conference of 1933. He proposed a similar ban on crimes against humanity during the Paris Peace Conference of 1945, but his proposal was turned down. 

Lemkin presented a draft resolution for a Genocide Convention treaty to a number of countries, in an effort to persuade them to sponsor the resolution. With the support of the United States, the resolution was placed before the General Assembly for consideration. The Convention on the Prevention and Punishment of the Crime of Genocide was formally presented and adopted on 9 December 1948. In 1951, Lemkin only partially achieved his goal when the Convention on the Prevention and Punishment of the Crime of Genocide came into force, after the 20th nation had ratified the treaty. 

Lemkin's broader concerns over genocide, as set out in his Axis Rule, also embraced what may be considered as non-physical, namely, psychological acts of genocide. The book also detailed the various techniques which had been employed to achieve genocide. 

​

Between 1953 and 1957, Lemkin worked directly with representatives of several governments, such as Egypt, to outlaw genocide under the domestic penal codes of these countries. Lemkin also worked with a team of lawyers from Arab delegations at the United Nations to build a case to prosecute French officials for genocide in Algeria. He also applied the term 'genocide' in his 1953 article "Soviet Genocide in Ukraine", which he presented as a speech in New York City. Although the speech itself does not use the word "Holodomor", Lemkin asserts that an intentional program of starvation was the "third prong" of Soviet Russification of Ukraine, and disagrees that the deaths were simply a matter of disastrous economic policy because of the substantially Ukrainian ethnic profile of small farms in Ukraine at the time. 

​

Recognition
For his work on international law and the prevention of war crimes, Lemkin received a number of awards, including the Cuban Grand Cross of the Order of Carlos Manuel de Cespedes in 1950, the Stephen Wise Award of the American Jewish Congress in 1951, and the Cross of Merit of the Federal Republic of Germany in 1955. On the 50th anniversary of the Convention entering into force, Lemkin was also honored by the UN Secretary-General as "an inspiring example of moral engagement." He was nominated for the Nobel Peace Prize ten times. 

​

In 1989 he was awarded, posthumously, the Four Freedoms Award for the Freedom of Worship. 

Lemkin is the subject of the plays Lemkin's House by Catherine Filloux (2005) and If The Whole Body Dies: Raphael Lemkin and the Treaty Against Genocide by Robert Skloot (2006). He was also profiled in the 2014 American documentary film, Watchers of the Sky.

Every year, The Rabbinic Call for Human Rights (T’ruah) gives the Raphael Lemkin Human Rights Award to a layperson who draws on his or her Jewish values to be a human rights leader. 

On 20 November 2015, Lemkin's article Soviet genocide in Ukraine was added to the Russian index of "extremist publications," whose distribution in Russia is forbidden. 

​

On 15 September 2018 the Ukrainian Canadian Civil Liberties Foundation (www.ucclf.ca) and its supporters in the US unveiled the world's first Ukrainian/English/Hebrew/Yiddish plaque honouring Lemkin for his recognition of the tragic famine of 1932–1933 in the Soviet Union, the Holodomor, at the Ukrainian Institute of America, in New York City, marking the 75th anniversary of Lemkin's address, "Soviet Genocide in the Ukraine".