The International Holocaust Remembrance Alliance (IHRA) developed a ‘Working Definition of Antisemitism’ in 2016. Whilst the definition has received a significant amount of media attention, we are not aware of any comprehensive philosophical analysis. This article analyses this definition. We conclude that the definition and its list of examples ought to be rejected. The urgency to do so stems from the fact that pro-Israel activists can and have mobilised the IHRA document for political goals unrelated to tackling antisemitism, notably to (...) stigmatise and silence critics of the Israeli government. This causes widespread self-censorship, has an adverse impact on freedom of speech, and impedes action against the unjust treatment of Palestinians. We also identify intrinsic problems in the way the definition refers to criticism of Israel similar ‘to that leveled against any other country’, ambiguous wording about ‘the power of Jews as a collective’, lack of clarity as to the Jewish people’s ‘right to self-determination’, and its denial of obvious racism. We consider alternative definitions and prefer one like the Oxford English Dictionary (OED) definition, ‘hostility to or prejudice against Jews’, with the addition of the words ‘as Jews’. We recognise that the Jerusalem Declaration on Antisemitism (JDA) can play a useful purpose in illustrating the shortcomings of the IHRA definition. However, we do not advocate promoting it as the prime international definition. Indeed, we question the efficacy of using complex new definitions to combat racism against Jews or other groups, and instead advocate combatting it through collective action across societies. (shrink)