Lal Bagh (Kannada: ಲಾಲ್ ಬಾಗ್, Hindi: लाल बाग़) or Lal Bagh Botanical Gardens, meaning The Red Garden in English, is a famous botanical garden in southern Bangalore, India. The garden was originally commissioned by Hyder Ali, the ruler of Mysore, and later finished by his son Tipu Sultan. It has a famous glass house which hosts an annual flower show. Lal Bagh houses India's largest collection of tropical plants, has an aquarium and a lake, and is one of the main tourist attractions in Bangalore.

Hyder Ali commissioned the building of this garden in 1760 but his son, Tipu Sultan, completed it. Hyder Ali decided to create this garden on the lines of the Mughal Gardens that were gaining popularity during his time. Hyder Ali laid out these famous botanical gardens and his son added horticultural wealth to them by importing trees and plants from several countries. Hyder Ali deployed people from Thigala Community who were extremely good in gardening. The Lal Bagh Gardens were commissioned by the 18th century and over the years it acquired India's first lawn-clock and the subcontinent's largest collection of rare plants.