The 1970 Dutch Open was a combined men's and women's tennis tournament staged in Hilversum, Netherlands. The tournament was played on outdoor clay courts and was held from 3 August until 9 August 1970. It was the 13th edition of the tournament. Tom Okker won the men's singles title and earned $3,000 first-prize money while Margaret Court won the women's singles event.

Finals

Men's singles

Netherlands Tom Okker defeated United Kingdom Roger Taylor 4–6, 6–0, 6–1, 6–3

Women's singles

Australia Margaret Court defeated Australia Kerry Melville 6–1, 6–1

Men's doubles

Australia Bill Bowrey / Australia Owen Davidson defeated Australia John Alexander / Australia Phil Dent 6–3, 6–4, 6–2

Women's doubles

Australia Karen Krantzcke / Australia Kerry Melville defeated Australia Margaret Court / West Germany Helga Niessen 3–6, 9–7, 7–5

Mixed doubles

United Kingdom Winnie Shaw / Australia Owen Davidson defeated Sweden Christina Sandberg / South Africa Bob Maud 4–6, 6–3, 7–5