| Arnold Wienholt Sr | |
| Constituency Am1: | Warwick |
| Assembly1: | Queensland Legislative |
| Term Start1: | 10 June 1863 |
| Term End1: | 25 June 1867 |
| Successor1: | George Clark |
| Birth Date: | 22 January 1826 |
| Birth Place: | Laugharne, Carmarthenshire, Wales |
| Death Place: | Locarno, Switzerland |
| Birthname: | Arnold Wienholt |
| Nationality: | Welsh Australian |
| Occupation: | Station Owner |
Arnold Wienholt, senior, (22 January 1826 – 16 January 1895) was a politician in Queensland, Australia. He was a Member of the Queensland Legislative Assembly, representing Warwick from 10 June 1863 to 25 June 1867. Wienholt was born in Laugharne, Wales and arrived in Australia .[1] His brother Edward Wienholt was also a Member of the Queensland Legislative Assembly and a landowner.