Councillor Harris is the 60th person to hold the position in the borough’s history.
Her appointment follows the council’s annual general meeting, which took place on May 18.
Councillor Harris previously served as deputy mayor and she attended more than 200 street parties across the borough.
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Cllr Harris said: “It is a huge privilege to serve as your new mayor, as I know how special the borough is as a place to live, work and raise a family.
“I have seen countless examples of dedicated volunteers and local groups working hard to make Bromley an even more special place, including from my time as deputy mayor.
“I now plan to play my part as your mayor in supporting and championing these efforts, including from my two mayoral charities that do such important work locally.
“So please do get in touch if you are holding events as I look forward to meeting as many of you as possible throughout the year.”
Councillor Harris represents West Wickham ward and previously represented Kelsey and Eden Park ward since 2018.
She has lived in the borough for more than 30 years and runs her own accountancy practice.
In addition, she has spent 17 years as a school governor and has been involved with the Park Langley Residents’ Association and local Friends of Parks groups.
For the 2026–27 term, the mayor’s chosen charities are Madlani Cancer Support, based in Orpington, and the Dyslexia Association of Bexley, Bromley, Greenwich and Lewisham.
Councillor Harris has named Councillor Sunil Gupta, who represents Bromley Common and Holwood, as deputy mayor.
Reverend Amanda Spence from St Mary’s in Hayes will serve as Mayoral Chaplain for 2026–27.
