Other than English, Romanian is now the most commonly spoken main language across the borough (spoken by 10,000 residents, increasing from around 4,000 people in 2011), followed by Urdu (4,800 residents), Bulgarian (4,400 residents), Polish (4,300 residents) and Turkish (3,500 residents). Italian and Spanish were both new entrants into the top 10 most-spoken languages in the borough.
Table 1. Top 10 languages in Waltham Forest other than English in 2021
| Language | 2021 Census | 2011 Census | Change (%) |
|---|
| Romanian | 10,600 | 4,000 | +162% |
| Urdu | 4,800 | 8,000 | -40% |
| Bulgarian | 4,400 | 2,200 | +104% |
| Polish | 4,300 | 8,000 | -47% |
| Turkish | 3,500 | 3,900 | -11% |
| Spanish | 2,500 | 1,500 | +60% |
| Portuguese | 2,200 | 1,900 | +16% |
| Panjabi | 2,000 | 3,000 | -32% |
| Italian | 2,000 | 1,000 | +95% |
| Tamil | 1,800 | 2,400 | -23% |