Hakka (Simplified Chinese: 客家话, Traditional Chinese: 客家話, Pronunciation in Hakka: Hak-ka-fa/-va, Pinyin: Kèjiāhuà) is a spoken variation of the Chinese language spoken predominantly in southern China by the Hakka ethnic group and descendants in diaspora throughout East and Southeast Asia and around the world.

The Hakka language has numerous variants or dialects, spoken in Guangdong, Fujian, Jiangxi, Guangxi, Sichuan, Hunan, Guizhou provinces, including Hainan island and Taiwan. Hakka is mutually unintelligible with Mandarin, Cantonese, Minnan or most of the significant spoken variants of the Chinese language.

Amongst the dialects of Hakka, the Moi-yen/Moi-yan (梅縣, Pinyin: Méixìan) dialect of northeast Guangdong has typically been viewed as a prime example of the Hakka language, forming a sort of standard dialect.

The Guangdong Provincial Education Department created an official romanisation of Meixian Hakka dialect in 1960, one of four languages receiving this status in Guangdong.

The Hakka language has as many regional dialects as there are counties with Hakka speakers in the majority. Surrounding Meixian are the counties of Pingyuan 平遠, Dabu 大埔, Jiaoling 蕉嶺, Xingning 興寧, Wuhua 五華, and Fengshun 豐順. Each is said to have its own special phonological points of interest. For instance, the Xingning does not have rimes ending in [-m] or [-p]. These have merged into [-n] and [-t] ending rimes, respectively. Further away from Meixian, the Hong Kong dialect lacks the [-u-] medial, so whereas Meixian dialect pronounces the character 光 as [kwɔŋ44], Hong Kong Hakka dialect pronounces it as [kɔŋ33], which is similar to the Hakka spoken in neighbouring Shenzhen.

As much as endings and vowels are important, the tones also vary across the dialects of Hakka. The majority of Hakka dialects have six tones, as typified by Meixian dialect above. However, there are dialects which have lost all of their Ru Sheng tones, and the characters originally of this tone class are distributed across the non-Ru tones. Such a dialect is ChangTing 長汀 which is situated in the Western Fujian province. Moreover, there is evidence of the retention of an earlier Hakka tone system in the dialects of Haifeng 海 豐 and Lufeng 陸 豐 situated on coastal south eastern Guangdong province. They contain a yin-yang splitting in the Qu tone, giving rise to seven tones in all (with yin-yang registers in Ping and Ru tones and a Shang tone).

The Hoi-liuk (Hailu 海陸) Hakka dialect speakers found on Taiwan originated from this region. This particular dialect contains postalveloar consonants ([ʃ], [ʒ], [tʃ], etc.), usually not found in other Chinese languages. Taiwan's other main population of Hakka speakers, the Sixian (Hakka: Siyen 四縣) speakers come from Jiaying 嘉應 and surrounding Jiaoling, Pingyuan, Xingning, and Wuhua dialects. Jiaying county later changed its name to Meixian.