| Election Name: | 1984 Colchester Borough Council election |
| Country: | Essex |
| Type: | parliamentary |
| Previous Election: | 1983 Colchester Borough Council election |
| Previous Year: | 1983 |
| Next Election: | 1986 Colchester Borough Council election |
| Next Year: | 1986 |
| Seats For Election: | 22 out of 60 seats to Colchester Borough Council |
| Majority Seats: | 31 |
| Turnout: | 41.9% (3.0%) |
| Party1: | Conservative Party (UK) |
| Last Election1: | 35 seats, 45.9% |
| Seats1: | 11 |
| Seats After1: | 34 |
| Seat Change1: | 1 |
| Popular Vote1: | 17,431 |
| Percentage1: | 42.9% |
| Swing1: | 3.0% |
| Party2: | Labour Party (UK) |
| Last Election2: | 16 seats, 25.8% |
| Seats2: | 4 |
| Seats After2: | 12 |
| Seat Change2: | 4 |
| Popular Vote2: | 11,460 |
| Percentage2: | 28.2% |
| Swing2: | 2.4% |
| Party3: | SDP-Liberal Alliance |
| Last Election3: | 5 seats, 25.4% |
| Seats3: | 5 |
| Seats After3: | 10 |
| Seat Change3: | 5 |
| Popular Vote3: | 10,214 |
| Percentage3: | 25.1% |
| Swing3: | 0.3% |
| Party4: | Tiptree Residents Association |
| Last Election4: | 3 seats, 2.9% |
| Seats4: | 1 |
| Seats After4: | 3 |
| Popular Vote4: | 936 |
| Percentage4: | 2.3% |
| Swing4: | 0.6% |
| Party5: | Independent politician |
| Last Election5: | 1 seat, 0.0% |
| Seats5: | 0 |
| Seats After5: | 1 |
| Popular Vote5: | 612 |
| Percentage5: | 1.5% |
| Swing5: | N/A |
| Council control | |
| Posttitle: | Council control after election |
| Before Election: | Conservative |
| After Election: | Conservative |
Elections to Colchester Borough Council were held on 5 May 1984, alongside other local elections across the United Kingdom.