Chinese New Year, also known as the "Spring Festival" (simplified Chinese: 春节; traditional Chinese: 春節; Pinyin: Chūn Jié) in modern China, is an important Chinese festival celebrated at the turn of the traditional lunisolar Chinese calendar. Celebrations traditionally run from the evening preceding the first day, to the Lantern Festival on the 15th day of the first calendar month. The first day of the New Year falls on the new moon between 21 Jan and 20 Feb. In 2017, the first day of the Chinese New Year was on Saturday, 28 January, initiating the year of the Rooster.

The New Year festival is centuries old and gains significance because of several myths and customs. Traditionally, the festival was a time to honor deities as well as ancestors. Chinese New Year is celebrated in countries and territories with significant Chinese populations, including Mainland China, Hong Kong, Macau, Singapore, Taiwan, Indonesia, Malaysia, Thailand, Vietnam, Cambodia, Mauritius, Australia, and the Philippines. Chinese New Year is considered a major holiday for the Chinese and has had influence on the lunar new year celebrations of its geographic neighbors.

Within China, regional customs and traditions concerning the celebration of the Chinese New Year vary widely. Often, the evening preceding Chinese New Year's Day is an occasion for Chinese families to gather for the annual reunion dinner. It is also traditional for every family to thoroughly clean the house, in order to sweep away any ill-fortune and to make way for incoming good luck. Windows and doors are decorated with red color paper-cuts and couplets with popular themes of "good fortune" or "happiness", "wealth", and "longevity". Other activities include lighting firecrackers and giving money in red paper envelopes. In about one third of the Mainland population, or 500 million Northerners, dumplings (especially those of vegetarian fillings) feature prominently in the meals celebrating the festival.

It is one of the world's most prominent and celebrated festivals, with the "largest annual mass human migration in the world".

According to tales and legends, the beginning of the Chinese New Year started with a mythical beast called the Nian. Nian would eat villagers, especially children. One year, all the villagers decided to go hide from the beast. An old man appeared before the villagers went into hiding and said that he's going to stay the night, and decided to get revenge on the Nian. All the villagers thought he was insane. The old man put red papers up and set off firecrackers. The day after, the villagers came back to their town to see that nothing was destroyed. They assumed that the old man was a deity who came to save them. The villagers then understood that the Nian was afraid of the color red and loud noises. When the New Year was about to come, the villagers would wear red clothes, hang red lanterns, and red spring scrolls on windows and doors. People also used firecrackers to frighten away the Nian. From then on, Nian never came to the village again. The Nian was eventually captured by Hongjun Laozu, an ancient Taoist monk. The Nian became Hongjun Laozu's mount.