The facilities, located at the Letham Mains development, will be used by Letham Primary School, local youth teams, and the general public.
The pitch, constructed by SportsMasters, meets Sport Scotland standards and can be used for various sports, including football, rugby, and hockey.
The changing pavilion, built by Cala Homes, features solar panels to reduce energy consumption.
Derek Lawson, Strategic Land Director with Cala Homes (East), said: "The overarching vision at Letham Mains was to create a vibrant and healthy community and expansion to the town.
"This sports facility is emblematic of this – and is a timely boost for the young people who will be able to train and bond through using it.
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"We hope it is embraced by the school and youth teams and serves the community for generations to come."
Councillor Colin McGinn, Cabinet Spokesperson for Community Wellbeing and Sport, Countryside and Leisure, said: "It’s vitally important that new developments bring a broader benefit to our region, whether through investing in infrastructure, or projects like this at Letham Mains.
"As a result of the creation of this fantastic facility, residents can now benefit and I hope that it encourages more young people to keep an active and healthy lifestyle."
Bill Axon, Chief Executive of Enjoy Leisure, said, "As East Lothian’s health and wellbeing charity, we’re committed to increasing activity participation levels across all ages, abilities, and backgrounds. With the introduction of this new pitch and pavilion, we’re hopeful that we’ll be a step closer to meeting our mission of creating happier, healthier communities.
"We look forward to working in partnership with East Lothian Council to manage this new facility."
The completion of works at the sports facility marks the latest milestone at Letham Mains, a masterplan development of 810 homes delivered by a mix of private developers and housing associations.
It includes a new linear park, civic square and Letham Primary School, the first school in East Lothian to be entirely funded by developer contributions.
More than 20,000 native species of trees and hedges have been planted across the site, including birch, oak, hawthorn and willow trees, while a series of footpaths including pedestrian bridges have been completed.
