Buckley, who has been with the company for seven years, has decided to pursue other business opportunities and will leave tomorrow (February 5).
Her departure follows an internal restructure that sees Richard Verney become head of buying and Claire Graham promoted to senior buyer.
Two internal candidates, Ana Sapungiu and Ben Gubbins, have been appointed to the position of trainee buyers.
Buckley began her career with Oddbins at its London-based stores, before moving into the buying department where she progressed from buying administrator to buyer.
She said: “My time at Oddbins has been extremely rewarding and has given me a tremendous breadth of experience within the trade.
“I am delighted to have been part of the buying team under the ownership of Simon Baile and Henry Young. It has been particularly satisfying to see that our work together over the last 18 months has finally put Oddbins back on track to be the best wine retailer in the UK.”
Managing director Baile added: “I thank Julie for her commitment and her significant contribution to the business over the years. She has done much to shape the buying department and the range.”
Oddbins has also named Des Cross its new finance director. Cross' previous posts include commercial director at Safeway and head of retail at Royal Sun Alliance.