Eli Cashdan (in Hebrew יהודה (בר יוסף דב) כשד"ן, in Yiddish יודל כשדן or Yiddle) 1 June 1905 – 14 November 1998) was a rabbi in the UK. He was a chaplain in the Royal Air Force during World War II, a senior lecturer at Jews' College and wrote a number of important books of Jewish interest.