The 1975 South Orange Open, also known as the Tennis Week Open, was a men's tennis tournament played on outdoor clay courts at the Orange Lawn Tennis Club in South Orange, New Jersey in the United States.

It was classified as a Group B category tournament and was part of the 1975 Grand Prix circuit.

Second-seeded Ilie Năstase won the singles title.

The final was delayed for two days due to rain.

[3][4] Ilie Năstase defeated Bob Hewitt 7–6, 6–1 Jimmy Connors / Ilie Năstase defeated Dick Crealy / John Lloyd 7–6, 7–5