The 2006 ARAG World Team Cup was a tennis tournament play on outdoor clay courts. It was the 28th edition of the World Team Cup, and was part of the 2006 ATP Tour. It took place at the Rochusclub in Düsseldorf, Germany, from 21 through 27 May 2006.
Argentina were the defending champions but they failed to advance beyond the group stage.Croatia defeated Germany in the final, by two rubbers to one for their first title.
| width=40 | Pos. | width=165 | Country | width=80 | Points | width=80 | Matches | width=80 | Sets |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 3–0 | 7–2 | 14–8 | ||||||
| 2 | 2–1 | 5–4 | 11–10 | ||||||
| 3 | 1–2 | 3–6 | 9–12 | ||||||
| 4 |  | 0–3 | 3–6 | 7–11 |
| width=40 | Pos. | width=165 | Country | width=80 | Points | width=80 | Matches | width=80 | Sets |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 3–0 | 6–3 | 15–8 | ||||||
| 2 |  | 2–1 | 5–4 | 14–9 | |||||
| 3 |  | 1–2 | 4–5 | 8–12 | |||||
| 4 |  | 0–3 | 3–6 | 6–14 |