The 1970 Pacific Southwest Open was a combined men's and women's tennis tournament played on outdoor hard courts at the Los Angeles Tennis Club in Los Angeles, California in the United States.

The men's tournament was part of the Grand Prix tennis circuit.

It was the 44th edition of the tournament and ran from September 21 through September 27, 1970.

Rod Laver and Sharon Walsh won the singles titles.

[3][4] Rod Laver defeated John Newcombe 4–6, 6–4, 7–6(7–5) Sharon Walsh defeated Lesley Hunt 6–3, 6–2 Tom Okker / Marty Riessen defeated Bob Lutz / Stan Smith 7–6, 6–2 Janet Newberry / Sharon Walsh defeated Esmé Emmanuel / Cecilia Martinez 6–3, 6–4