The agreement sees Marathonbet become the club's official global betting partner, excluding China and the United States.
United group managing director Richard Arnold said on Wednesday on manutd.com: "Manchester United has a global presence with fans all over the world and our partners help us to engage with them in a range of innovative ways.
"Marathonbet already operates in over 20 languages and understands the importance we put on operating on a global scale.
"Through our partnership, we hope to bring to fans exclusive content, access to bespoke player and legend interviews as well as competitive betting odds."
Want to write for United Mad? Get in touch!
Source: PA