Adalbert Rethi (6 May 1943, Târgu Mureș - 14 October 2008, Hungary) was an ethnic Hungarian table tennis player from Romania.
While playing for Dinamo Târgu Mureș he was discovered by Farkas Paneth, who took him to CSM Cluj.
His first international success was at the 1959 Youth Table Tennis European Championship, where he won the doubles competition with Radu Negulescu.
In the national championships he won 16 titles, among them three in the singles competition[2] four in the doubles with Radu Negulescu,[3] one in the mixed with Eleonora Mihalcă[4] and the rest as a team member of CSM Cluj (alongside Dorin Giurgiuca, Radu Negulescu, etc.
After high school, he studied law at the Babeș-Bolyai University in Cluj, and became a lawyer.