Seetawaka Botanical Garden, or Seethawaka Wet Zone Botanical Garden, is one of the five botanical gardens in Sri Lanka. Seetawaka Botanical Garden is situated on the Puwakpitiya-Thummodara main road, at Illukowita, adjacent to the Indikada Mukalana Forest Reserve at Avissawella. The 32 ha (79 acres) garden has a cool temperate climate.
A beautiful stream flows through the garden, which sustains the existence of various wet zone plants. The tree cover is made up of large Terminalia arjuna trees.
The garden mainly serves as a research area for different universities around the country. It is also used as a conservation area for threatened and vulnerable endemic plant species in the Sinharaja Rain Forest region. Improving export floriculture, ex-situ conservation of wet lowland plants, and bamboo cultivation are also promote in the garden.