The claim that Ireland as a state officially declared Israel a terrorist state is false because while a far-left independent politician, Catherine Connolly, who has called Israel a terrorist state, was elected president, there is no evidence that the Irish government or parliament has made an official declaration labeling Israel as a terrorist state.
Ireland declared Israel as a Terrorist State.

Irish President Catherine Connolly formally declaring Israel a terrorist state during a recent public address. The far-left independent leader emphasized that Ireland’s history of colonization shapes its firm stance on global sovereignty and human rights now.
Source: threads.com
Key Evidence
Catherine Connolly publicly called Israel a terrorist state and was elected president.
threads.comthreads.comIrish President Catherine Connolly formally declaring Israel a terrorist state...
timesofisrael.comtimesofisrael.comFar-left candidate who called Israel 'terrorist state' elected president of...
ynetnews.comynetnews.comFar-left Irish lawmaker who called Israel a 'terrorist state' elected president...
The Irish parliament passed motions critical of Israeli actions but did not officially declare Israel a terrorist state.
en.wikipedia.orgen.wikipedia.orgIreland–Israel relations
irishtimes.comirishtimes.comIreland becomes first EU country to declare Israel is involved in ‘de facto...
Diplomatic tensions exist between Ireland and Israel with strong rhetoric but no formal state-level designation of terrorism.
spectator.comspectator.comHow Ireland declared diplomatic war on Israel
jns.orgjns.orgThe diplomatic crisis between Israel and Ireland - Israel & Jewish News
What the Evidence Shows
The sources indicate that Catherine Connolly, an independent far-left politician known for her critical rhetoric against Israel, including calling it a terrorist state, was elected president of Ireland. However, this is a personal and political stance of an individual leader rather than an official state declaration. Ireland’s parliament has passed motions critical of Israeli policies, such as declaring Israeli settlement building in Palestinian territories as de facto annexation and recognizing a Palestinian state, but these do not amount to an official designation of Israel as a terrorist state by the Irish government.
Several sources describe diplomatic tensions and harsh rhetoric between Ireland and Israel, with some commentators framing Ireland’s stance as hostile or akin to a diplomatic war. Nonetheless, no formal governmental or parliamentary declaration labeling Israel as a terrorist state has been documented in the provided sources.