| Settlement Type: | town |
| Grinkiškis | |
| Pushpin Map: | Lithuania |
| Pushpin Map Caption: | Location of Grinkiškis |
| Coordinates: | 55.5556°N 23.6333°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Ethnographic region |
| Subdivision Name1: | Aukštaitija |
| Subdivision Type2: | County |
| Subdivision Name2: | Šiauliai County |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Radviliškis District Municipality |
| Subdivision Type4: | Eldership |
| Subdivision Name4: | Grinkiškis Eldership |
| Subdivision Type6: | Capital of |
| Subdivision Name6: | Grinkiškis Eldership |
| Population Total: | 678 |
| Population As Of: | 2011 |
| Timezone: | EET |
| Utc Offset: | +2 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +3 |
Grinkiškis (pl|Grynkiszki, yi|גרינקישאָק, Grinkishok) is a town in the Radviliškis District Municipality in Šiauliai County, Lithuania. It is situated on the Šušvė River. It is the seat of an eldership. According to the 2021 census, the town had a population of 550.[1] The town was first mentioned in 1454 and soon became property of the Gatavičius family. Krzysztof Gatavičius, thankful for his military achievements, built a church in 1618. The present church was built in 1875.
In 1999, the coat of arms of Grinkiškis were approved by a presidential decree. The coat of arms depict a golden angel on one knee, who holds a silver lily with three blooms. The angel was borrowed from one of the two surviving crosses in town's cemetery, made by 19th-century dievdirbys Vincas Svirskis. The lily, a symbol of purity and innocence, represents Blessed Virgin Mary – patron of the town and namesake of its church.