| Siegfried Pfeiffer | |
| Fullname: | Siegfried Pfeiffer |
| Birth Date: | 19 October 1883 |
| Position: | Striker |
| Years1: | 1899–1908 |
| Clubs1: | FC Basel |
| Caps1: | 32 |
| Goals1: | 16 |
| Nationalyears1: | 1908 |
| Nationalteam1: | Switzerland |
| Nationalcaps1: | 1 |
| Nationalgoals1: | 2 |
Dr Siegfried Pfeiffer (19 October 188315 February 1959) was a Swiss international footballer. He played mainly as striker, but also as midfielder.
Between the years 1899 und 1908 Pfeiffer played a total of 72 games for FC Basel scoring a total of 28 goals.[1] He was also member of the FC Basel board of directors. He presided the club's board during the 1907–08 season.[2]
He also played for the Swiss national team. On 5 April 1908 Pfeiffer scored two goals in the legendary 5–3 victory over Germany at the Landhof in Basel.[3] This was the first national team game for the Germans.[4]