Macquarie Culvert, Brick footbridge in Royal Botanic Gardens, Sydney, Australia.

The Macquarie Culvert is a double brick culvert beneath the original Mrs Macquarie's Road in the Royal Botanic Gardens, Sydney. It was probably built between 1813 and 1816, at the same time as the road, and is almost certainly the oldest bridge in Australia. The culvert was restored in 2002.

Built between 1813 and 1816 during Governor Macquarie's administration, this culvert was part of an early road development. It remains one of Australia's oldest surviving bridge structures.

The culvert takes its name from Elizabeth Macquarie, wife of Governor Lachlan Macquarie, for whom the road above was built. It carried the original Mrs Macquarie's Road, the only surviving trace of that route, and was restored in 2002.

The structure is easily accessible from the garden's walking paths and best visited during daylight hours. Access is straightforward as it forms part of the established pathway network.

The culvert was probably built between 1813 and 1816 alongside the original road, which ran from the first Government House, now the site of the Museum of Sydney, to Yurong or Anson Point, today Mrs Macquarie's Point. Governor Lachlan Macquarie ordered the road built for his wife Elizabeth. The culvert was restored in 2002.