| Election Name: | 1973 Thamesdown Borough Council election |
| Type: | parliamentary |
| Next Election: | 1976 Thamesdown Borough Council election |
| Next Year: | 1976 |
| Seats For Election: | 46 seats to Thamesdown Borough Council |
| Majority Seats: | 24 |
| Party1: | Labour Party (UK) |
| Seats1: | 26 |
| Seats After1: | 26 |
| Seat Change1: | 26 |
| Party2: | Conservative Party (UK) |
| Last Election1: | N/A |
| Last Election2: | N/A |
| Seats2: | 18 |
| Leader3: | Independents |
| Last Election3: | N/A |
| Seats3: | 2 |
| Seats After2: | 18 |
| Seats After3: | 2 |
| Seat Change2: | 18 |
| Seat Change3: | 2 |
The 1973 Thamesdown Borough Council election took place on 7 June 1973 to elect members of Thamesdown Borough Council, a predecessor to Swindon Borough Council in Swindon, Wiltshire, England. It was the first election to the district council, although it acted as a "shadow authority" until 1 April 1974, where it gained full responsibilities as laid out in the Local Government Act 1972.
The whole council was up for election, and Labour gained a majority, winning 26 out of 46 seats on the council.
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