Charities and community groups can apply for one of two £50,000 donations.
The Overview and Scrutiny Committee of the Royal Borough of Greenwich invites feedback on the Thames Path as part of a scrutiny review.
They will consider applications for financial support from any eligible charity investing in programmes providing demonstrably positive environmental, social or wellbeing outcomes.
Barchester Charitable Foundation supports applications from community groups and registered charities that combat isolation and loneliness and enable older people and adults with disabilities to be active and engaged.
Womble Bond Dickinson Foundation is offering one-off grants of up to £5,000 for charities to deliver projects and activities that make a positive impact in local communities.
The marathon has become the most successful one-day annual fundraising event in the world since its founding in 1981.