| Siennica-Święchy | |
| Settlement Type: | Village |
| Total Type: | |
| Subdivision Type: | Country |
| Subdivision Type1: | Voivodeship |
| Subdivision Name1: | Podlaskie |
| Subdivision Type2: | County |
| Subdivision Name2: | Wysokie Mazowieckie |
| Subdivision Type3: | Gmina |
| Subdivision Name3: | Czyżew-Osada |
| Coordinates: | 52.8111°N 22.4169°W |
| Pushpin Map: | Poland |
Siennica-Święchy (pronounced as /pl/) is a village in the administrative district of Gmina Czyżew-Osada, within Wysokie Mazowieckie County, Podlaskie Voivodeship, in north-eastern Poland.[1]