Martin Vassallo Argüello (born February 10, 1980 in Temperley, Argentina) is a professional male tennis player from Argentina. His career-high ATP entry ranking is #47 (as of April 27, 2009).
He turned pro in 1999. Over the course of his career, he has represented both Argentina and Italy.
At the 2006 French Open, he reached the fourth round of a Grand Slam event for the first time in his career. He entered the tournament as a qualifier and beat Paul Goldstein of the United States in the first round (6–2, 6–0, 6–3), #21 seed Sébastien Grosjean of France in the second round (1–6, 6–4, 4–6, 7–5, 6–2) and Raemon Sluiter of the Netherlands in the third round (2–6, 6–4, 6–3, 3–6, 6–1). In the next round he lost to David Nalbandian.