Martín Varsavsky Waisman-Diamond (born April 26, 1960) is an Argentine entrepreneur and philanthropist based in Spain who founded several companies worldwide, as well as serving as an early-stage investor in others.

At the age of 17, he moved with his family to the United States as a refugee supported and assisted by B'nai B'rith, following the forced disappearance of his cousin, David Horacio Varsavsky.

[citation needed] In 1984, at the age of 24 and still in college, Varsavsky created Urban Capital Corporation, a real estate company in New York that was one of the early developers of loft apartments.

[4] Urban Capital Corporation purchased industrial buildings and recycled them into residential apartments and offices, developing up to 50 thousand square meters in the SoHo and Tribeca neighborhoods of New York City.

Headquartered in Madrid and with its own infrastructure, the company became a telecommunications operator offering bandwidth for residential and commercial customers, competing with Telefónica.

[19] He has been an investment partner in early-stage companies including iTravel, Aura Biosciences, Menéame, Netvibes, Plazes, Technorati, Eloquii, Dopplr, Tumblr, Hipertextual, Busuu, 23andMe, MUBI and Result.

[20] Outside of telecommunications, he was the majority shareholder of the wind park El Moralejo (a renewable energy generator) and Proesa, owner of the fashion labels Sybilla and Jocomomola.

In September 2020 he temporarily left Spain for Berlin with his family as a self-proclaimed "COVID-19-refugee", in protest for the measures implemented by the Spanish government to manage the COVID-19 pandemic.

[22] Varsavsky has been over the years a staunch critic of the Spanish government led by Prime Minister Pedro Sánchez, showing his support for conservative figures like Madrid's regional president Isabel Díaz Ayuso.

In January 2025 Varsavsky explained in a Twitter post[23] that he promoted, in his role as member of Axel Springer's supervisory board, Elon Musk's opinion piece for Die Welt in which he supported the far right Alternative for Germany in the upcoming German federal election.