The Government Botanical Garden is a botanical garden in Udhagamandalam, near Coimbatore (Ooty), Tamil Nadu state, India laid out in 1848. The gardens, divided into several sections, cover an area of around 22 hectares (54 acres), and lie on the lower slopes of Doddabetta peak. The garden has a terraced layout. It is maintained by the Tamil Nadu Horticulture Department.

It ascends the slopes of the hill at an elevation of 2250–2500 metres above mean sea level. The garden enjoys a temperate climate, with an average rainfall of 140 cm, the most of which is received during south-west monsoon, with frosty nights from November to February. The maximum and minimum temperatures are 28 °C and 0 °C respectively.

The Government Botanical Garden, Udhagamandalm, was established in 1848. Its architect was William Graham McIvor. The Marquis of Tweedale prepared the initial layout during the late 1840s. The gardens were established by a subscription of Rs 3 per month amongst the European residents for the purpose of supplying vegetables at a reasonable cost. During the time that Ootacamund was under British control, considerable cultivation of vegetables for the market was carried on by the European settlers and others. Captain Molyneux of the 2nd European Regiment managed the vegetable cultivation. The subscribers received vegetables free of cost. But this arrangement did not work out and in early 1847, a fund was raised by means of donations and subscriptions with a view to forming a horticultural society and a public garden.

There were very few horticulturists at that time. Seeds and saplings were not available locally, but were available in nearby jungles. It was proposed to establish a public garden. For this purpose, wood was selected between Lushington Hall (the present Hebron School) and General Sewell's Property (the present Raj Bhavan). Shortly after the formation of the society, the committee requested state aid for providing a scientific and practical gardener and funds to meet his salary. This suggestion was accepted, and Mr. W.G. McIvor from the Royal Botanic Gardens, Kew, was sent to Ootacamund by the East India Company. He arrived in March 1848, converted the upper portion, which was a forest, and the lower portion, which was a swamp, into a beautiful garden. He submitted a report at the end of 1848 to the East India Company in London. He took ten years to complete the layout of the garden.

The gardens have around a thousand species, both exotic and indigenous, of plants, shrubs, ferns, trees, herbal and bonsai plants. In the centre of the gardens lie a fossilized tree trunk estimated to be 20 million years old. The gardens consist of several lawns with flowering plants, ponds with lilies, beds of flowers and ferns laid out in an Italian style, several plots of flowering plants, a variety of medicinal plants.

The present botanical gardens are divided into six sections: the Lower Garden, New Garden, Italian Garden, Conservatory, Fountain Terrace and Nurseries.

The lower garden comprises the entrance and the lower lawns. The entrance of the garden leads into an extensive lush green lawn of Kikiyu grass (Pennisetum Clandestinum) which is known for its springy vigour. A fern house with 127 species of ferns is situated on the left along the road leading to Raj Bhavan amidst another expanse of lawns and historic gatehouses. The prime attractions in this section are the carpet-bet design of the map of the Indian Union laid out with selective plants and the fossil trunk of 20 million years old, erected on a pedestal.

Tree species of botanical interest such as Hymenosporum flavum, Cordyline australis, Cedrus deodara, Cupressus funebris, Araucaria bidwillii, Cupressus macrocarpa, Cryptomeria japonica, Eucalyptus maculata, Eucalyptus citriodora, Salix babylonica, Salix heterophylla, Podocarpus taxifolia, Dracaena lanuginosa, Pinus patula, Rhododendron arboreum, Quercus montana, Quercus cerris, Quercus serrata, Quercus griffithii, Quercus ilex, and Magnolia grandiflora can be seen alongside the lawn.