Former and lost communities in Markham lists communities that have disappeared in Markham, Ontario, because they were renamed or no longer exist.
| Official Name: | Australia |
| Settlement Type: | Neighbourhood |
| Pushpin Map: | Canada Southern Ontario |
| Subdivision Type: | Country |
| Subdivision Name: | Canada |
| Subdivision Type1: | Province |
| Subdivision Name1: | Ontario |
| Subdivision Type2: | Regional municipality |
| Subdivision Name2: | York |
| Subdivision Type3: | City |
| Subdivision Name3: | City of Markham |
| Established Title: | Settled |
| Timezone: | EST |
| Utc Offset: | -5 |
| Timezone Dst: | EDT |
| Utc Offset Dst: | -4 |
| Postal Code Type: | Forward sortation area |
| Postal Code: | L6B |
| Area Code: | 905 and 289 |