| Date: | 11–17 June |
| Edition: | 65th |
| Category: | Grand Prix (B) |
| Surface: | Clay / outdoor |
| Draw: | 64S / 32D |
| Prize Money: | $50,000 |
| Location: | Hamburg, West Germany |
| Champms: |  Eddie Dibbs[1] |
| Champmd: | Jürgen Fassbender / Hans-Jürgen Pohmann[2] |
| Champwd: | Helga Masthoff / Heide Orth |
| Before Name: | Grand Prix German Open |
The 1973 German Open was a combined men's and women's tennis tournament played on outdoor clay courts. It was the 66th edition of the event and was part of the 1973 Commercial Union Assurance Grand Prix circuit. It took place at the Am Rothenbaum in Hamburg, West Germany, from 11 June until 17 June 1973. Eddie Dibbs and Helga Masthoff won the singles titles.[3]
Eddie Dibbs defeated Karl Meiler 6–1, 3–6, 7–6, 6–3
Helga Masthoff defeated Pat Pretorius 6–4, 6–1
Jürgen Fassbender / Hans-Jürgen Pohmann defeated 
Manuel Orantes / 
Ion Țiriac 7–6, 7–6, 7–6
Helga Masthoff / Heide Orth defeated Kristien Kemmer / Laura Rossouw 6–1, 6–2