Chief Rabbi Mirvis wrote via Twitter: "Her Majesty The Queen is very much in my prayers today and I know that Jewish communities around the Commonwealth will join me in wishing her a full and swift recovery."
The Board of Deputies of British Jews also posted a message to Twitter, writing: "Along with the nation, our thoughts are with Her Majesty and the Royal Family. We hope and pray for her at this uncertain hour. "
The Community Security Trust, a charity that helps the UK Jewish community with security issues, stated: "Our thoughts and prayers are with HM The Queen and her family."
Tzipi Hotovely, the Israeli Ambassador to the United Kingdom, wrote in a social media statement: "My thoughts and prayers are with Her Majesty The Queen and her Royal family, following the deeply troubling statement from Buckingham Palace this afternoon.
"I wish The Queen a full and speedy recovery. רפואה שלמה"
The Jewish Leadership Council wrote: "Our thoughts and prayers are with HM The Queen and her family at this time."
Liberal Judaism CEO Rabbi Charley Baginsky said: “Everyone at Liberal Judaism is thinking of The Queen and Royal Family at this worrying time.”
Rabbi René Pfterzel, co-chair of the Conference of Liberal Rabbis and Cantors, added: “We are all concerned by the news about Her Majesty’s health and we pray for her and the Royal Family. May God give them strength.
Rabbi Joseph Dweck, the Senior Rabbi of the Spanish and Portuguese Sephardi Community of the UK tweeted: "God save the Queen. 🙏😑👑".
Dr Daniel Susskind, a Fellow in Economics at Balliol College, Oxford University, wrote that: "The Queen is our 'mystic chord of memory', in this way — and many more," in response to a post referring to the fact that Elizabeth II's first prime minister Winston Churchill was born in 1874, while current prime minister Liz Truss was born in 1975.
The Centre for Israel and Jewish Affairs, the advocacy agent of Jewish Federations across Canada, tweeted: "On behalf of #Canada's Jewish community, wishing Her Majesty #QueenElizabeth II a full 'refuah shlema,' a speedy recovery, and return to strength."
A spokesman for The UK Movement for Reform Judaism said: "The Movement for Reform Judaism and all our 43 communities wish Her Majesty the Queen a full recovery. We regularly pray for her health as part of our weekly Shabbat services, and she remains very much in our thoughts today."
Neville Kahn, Chair of Trustees at Norwood, of which Her Majesty is a patron, wrote: “On behalf of everyone at Norwood, I would like to wish a speedy recovery to Our Patron Her Majesty The Queen. We are thinking of Prince Charles and all the Royal Family at this difficult time.”
Laurence Saffer of Bradford Synagogue told the Telegraph & Argus: "The Jewish Community sends its thoughts and prayers to Her Majesty the Queen and all the Royal Family at this most difficult time.”
The Pinter Trust, a Charedi organisation, also commented on the news via Twitter: "Our thoughts and prayers are with HM the Queen and the Royal Family. ק-ל נא רפא נא לה"
