The competitive polo event runs on 3, 4, and 5 June at Hurlingham Park, Hammersmith, in London.
As well as being a key sponsor of the event, City AM has re-signed as sponsor of the New York polo team, which won the competition last year.
The New York polo team will wear branded City AM-branded team tops, while CityAM flags will be paraded around the park before each game.
No financial details of the deal have been disclosed.
The event will feature food from the Harrods Food Court, with afternoon tea packages and picnic hampers available.
Champagne brand Veuve Clicquot is partnering with the event to create a champagne garden.
The event is expected to attract more than 32,000 people and will be broadcast on Sky Sports.
Lawson Muncaster, managing director at City AM, said: "Following the immense success of last year’s event, City AM is very excited to be involved again in only the third polo tournament to be played at Hurlingham Park in nearly 100 years. We hope our readers will all want to join us on City Friday."
In January, after signing a deal to become the official newspaper of the Investec Derby horse racing festival. The 20-page edition will be issued on Saturday 4 June.
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