The 1999 German Open was a men's tennis tournament played on outdoor clay courts. It was the 93rd edition of the Hamburg Masters (German Open), and was part of the ATP Super 9 of the 1999 ATP Tour. It took place at the Rothenbaum Tennis Center in Hamburg, Germany, from through 3 May through 10 May 1999.

Marcelo Ríos defeated Mariano Zabaleta 6–7^(5–7), 7–5, 5–7, 7–6^(7–5), 6–2

Wayne Arthurs / Andrew Kratzmann defeated Paul Haarhuis / Jared Palmer 4–6, 7–6^(7–5), 6–4