Tomáš Čatár (born 19 January 1977) is a Slovak former professional tennis player.

On the professional circuit he reached a career high singles ranking of 239 in the world and made his only ATP Tour main draw appearances at the 1998 Croatia Open Umag, as a qualifier.

In 1999 he competed for Slovakia at the World Team Cup in Düsseldorf, alongside Karol Kučera and Dominik Hrbatý.

He played in two doubles matches, both partnering Hrbaty, against France and the United States.

They won the match against France, who were represented by Nicolas Escudé and Guillaume Raoux.