last but not least
used when mentioning the last person or thing in a list, to emphasize that they are still important

[TahlilGaran] Dictionary of Contemporary English ▲

last but not least
important, despite being mentioned at the end.
The mall has sports and shoe and clothing stores and, last but not least, plenty of terrific places to eat.

[TahlilGaran] English Idioms Dictionary ▲

last but not least
in the last place but not the least important
Last but not least the boy came up to the front of the class to receive his report card.

[TahlilGaran] English Idioms Dictionary ▲

last but not least
adv. phr. In the last place but not the least important.
Billy will bring sandwiches, Alice will bring cake, Susan will bring cookies, John will bring potato chips, and last but not least, Sally will bring the lemonade.

[TahlilGaran] English Idioms Dictionary ▲