last but not least

last but not least

A phrase used to emphasize that someone or something is still significant, despite being mentioned last in a list of people or things. And last but not least, our stalwart IT staff—this issue never would have been published without them!
See also: but, last, least, not
Farlex Dictionary of Idioms.

last but not least

Cliché last in sequence, but not last in importance. (Often said when introducing people.) The speaker said, "And now, last but not least, I'd like to present Bill Smith, who will give us some final words." And last but not least, here is the final graduate.
See also: but, last, least, not
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

last but not least

Last in sequence but not least in importance, as in Last but not least, I want to thank all the people who sent me copies of my article in the paper . [Late 1500s]
See also: but, last, least, not
The American Heritage® Dictionary of Idioms by Christine Ammer.

last but not least

COMMON You use last but not least to say that the last person or thing to be mentioned is as important as all the others. We are pleased to welcome her four sons, Christopher, twins Daniel and Nicholas, and last but not least 2-year-old Jack. And last but not least, try to eat fresh fruit rather than desserts loaded with sugar.
See also: but, last, least, not
Collins COBUILD Idioms Dictionary, 3rd ed.

last but not least

last in order of mention or occurrence but not of importance.
See also: but, last, least, not
Farlex Partner Idioms Dictionary

ˌlast but not ˈleast

,

ˌlast but by no means ˈleast

used to say that the last person or thing on a list, etc. is as important as the others: He thanked everyone for their help: Mr Watkins, Ms Smith, Ms Jackson, and last, but by no means least, Mr Jones.
See also: but, last, least, not
Farlex Partner Idioms Dictionary

last but not least

Last in a sequence but not least in importance. This expression dates from the sixteenth century, when it was used by John Lyly, who may have been its originator. “Of these three but one can stand me in steede, the last, but not the least” (Euphues and His England, 1580). Soon afterward it was used by Sir Philip Sidney, Edmund Spenser, and several times by Shakespeare (Julius Caesar, King Lear).
See also: but, last, least, not
The Dictionary of Clichés by Christine Ammer
See also:
  • the last of the lot
  • at the last count
  • in the last chance saloon
  • saloon
  • at the last chance saloon
  • last chance (for/at/to do something)
  • Let’s have it!
  • let's have it
  • to the last
  • the last chance saloon