People named Liddell include:
- Alice Liddell, Lewis Carroll's "muse"
- Andy Liddell, Scottish footballer
- Anne Liddell-Grainger, mother of Ian Liddell-Grainger
- Sir B. H. Liddell Hart, British military strategist
- Billy Liddell, Scottish footballer
- Chuck Liddell, mixed martial artist
- David Liddell-Grainger, Deputy Lieutenant of Berwickshire
- Eric Liddell, Scottish athlete
- Frank Liddell (politician), Australian politician
- Frank Liddell (record producer), American record producer
- Guy Liddell, British intelligence officer
- Helen Liddell, British politician
- Henry Liddell, Classical scholar and father of Alice Liddell
- Henry Liddell, 1st Baron Ravensworth
- Ian Liddell-Grainger, Member of Parliament for Bridgwater
- John Aidan Liddell, Victoria Cross recipient
- Patrick Liddell, Composer and video artist
- Peter Liddell-Grainger, 323rd in Line of succession to the British throne
- Robert Liddell, Mayor of Pittsburgh, Pennsylvania
- Robert Scotland Liddell, British journalist
- St. John Richardson Liddell, Louisiana planter and Confederate general
- Thomas Liddell, first Principal of Queen's University, Kingston, Ontario
- Ian Oswald Liddell, Victoria Cross recipient