Clif Bar and the TCS London Marathon: A Partnership Built to Fuel Every Runner

This week brought exciting news from the heart of the UK’s running calendar as Clif Bar was unveiled as the Official Energy Bar Partner of the TCS London Marathon — a collaboration that will stretch across the next three editions of the iconic event, from 2026 through 2028.

For both brands, this partnership makes perfect sense. The London Marathon is more than just a race — it’s a global celebration of endurance, community and personal achievement. Clif Bar, with its heritage rooted in fuelling athletes with purpose-built, plant-based energy, now joins the event not just as a sponsor, but as a partner committed to supporting runners every step of the way.

From seasoned marathoners chasing a personal best to first-time participants tackling the 26.2 miles for charity, preparation and recovery are everything — and that’s where Clif Bar’s products come in. As part of the partnership, Clif will be on the ground at the London Marathon Running Show in the lead-up to race day, offering samples and encouragement to participants as they fine-tune their training.

Bianca Harvey, Clif Director for Europe at Mondelez, emphasised that the brand shares the Marathon’s ethos: “empowering every participant … to perform their best and experience the joy of the Finish Line.” That sense of shared purpose is at the core of why this partnership resonates — it’s not just about sponsorship visibility, but about meaningful support for the sport’s participants.

With the 2026 TCS London Marathon set for Sunday, April 26, this partnership puts Clif Bar in a strong position to engage directly with an enthusiastic running community, while reinforcing the event’s broader mission to inspire and uplift participants from start line to finish.