As gold sponors of Pride, 240 Starbucks employees marched in the parade, which took place on 8 July.
Maria Sebastian, Starbucks' senior vice-president, brand, said: "Diversity's always been a core part of our brand. We've always been known for creating welcoming and inclusive environments; whether it's in our stores or in the broader communities that we serve. So we're really excited to be in our third year as a gold sponsor for Pride of London."
Nine Starbucks stores were wrapped in Pride branding, as well as nine stores along the parade route serving Frappucinos, topped with rainbow-coloured heart sprinkles.
Five of the coffee chain's outlets also featured Glam Stops, where parade-goers were able to get into the festival spirit with glitter makeup from Gypsy Shrine.