植树节（National Tree Planting Day）为每年三月十二日。 植树节是按照法律规定宣传保护树木，并组织动员群众积极参加以植树造林为活动内容的节日。按时间长短可分为植树日、植树周和植树月，共称为国际植树节。提倡通过这种活动，激发人们爱林造林的热情、意识到环保的重要性。

中国的植树节由凌道扬和韩安、裴义理等林学家于1915年倡议设立，最初将时间确定在每年清明节。1928年，国民政府为纪念孙中山逝世三周年，将植树节改为3月12日。新中国成立后的1979年，在邓小平提议下，第五届全国人大常委会第六次会议决定将每年的3月12日定为植树节。2020年7月1日起，施行新修订的《中华人民共和国森林法》，明确每年3月12日为植树节。

National Tree Planting Day is observed on March 12 each year. This day is designated by law to promote the protection of trees and to organize and mobilize people to actively participate in tree planting and afforestation activities. It is categorized into Tree Planting Day, Tree Planting Week, and Tree Planting Month, collectively known as International Tree Planting Day. The aim is to inspire enthusiasm for tree planting and to raise awareness about the importance of environmental protection.

In China, Tree Planting Day was first proposed in 1915 by forestry experts Ling Daoyang, Han An, and Pei Yili, and was initially set for the Qingming Festival each year. In 1928, the National Government changed the date to March 12 to commemorate the third anniversary of Sun Yat-sen's death. After the founding of the People's Republic of China, the date was officially established as March 12 by the Sixth Session of the Fifth National People's Congress Standing Committee in 1979, following a proposal by Deng Xiaoping. Starting from July 1, 2020, the revised Forest Law of the People's Republic of China has officially recognized March 12 as Tree Planting Day.