| Election Name: | 1999 Northampton Borough Council election |
| Country: | England |
| Type: | Parliamentary |
| Ongoing: | no |
| Party Colour: | yes |
| Previous Election: | 1995 Northampton Borough Council election |
| Previous Year: | 1995 |
| Next Election: | 2003 Northampton Borough Council election |
| Next Year: | 2003 |
| Seats For Election: | All 45 seats in the Northampton Borough Council |
| Majority Seats: | 23 |
| Election Date: | 6 May 1999 |
| Party1: | Labour Party (UK) |
| Seats1: | 28 |
| Seat Change1: | 7 |
| Party2: | Liberal Democrats (UK) |
| Seats2: | 11 |
| Seat Change2: | 5 |
| Party3: | Conservative Party (UK) |
| Seats3: | 8 |
| Seat Change3: | 7 |
| Council control | |
| Posttitle: | Council control after election |
| Before Election: | Labour |
| After Election: | Labour |
Elections to the Northampton Borough Council were held on 6 May 1999. The whole council was up for election with boundary changes since the last election in 1995 increasing the number of seats by 4. The Labour party stayed in overall control of the council.
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Numbers in parentheses indicate number of candidates to be elected.