双元音
關於拼字時兩個一組的元音字母，且通常不分別發成兩個元音的情況，請見“二合字母”。 | 本页面包含国际音标符号，部分操作系统及浏览器需要特殊字母与符号支持才能正確显示为正确的IPA符号，否则可能出现乱码、问号、空格等其它符号。 |
 | 查询維基詞典中的diphthong。 |
American English pronunciation of no highway cowboys, showing five diphthongs: /oʊ aɪ eɪ aʊ ɔɪ/
雙元音（diphthong）是一種複元音（compound vowel），又稱雙母音或二合複元音，在语音学中，指联合的两个元音，它们作为一个整体出现。之间有平滑的过渡，也就是說，雙元音中的發音牽涉到兩種不同的舌位，並且從其中一種舌位滑動到另一舌位。在国际音标 (IPA) 中，单元音用一个字母表示，如.mw-parser-output .IPAfont-family:"Charis SIL","Doulos SIL","Linux Libertine","Segoe UI","Lucida Sans Unicode","Code2000","Gentium","Gentium Alternative","TITUS Cyberbit Basic","Arial Unicode MS","IPAPANNEW","Chrysanthi Unicode","GentiumAlt","Bitstream Vera","Bitstream Cyberbit","Hiragino Kaku Gothic Pro","Lucida Grande",sans-serif;text-decoration:none!important.mw-parser-output .IPA a:link,.mw-parser-output .IPA a:visitedtext-decoration:none!important[ʌ]。双元音用两个字母表示，如[aɪ]，響度較低的字母可以加上 ̯ 符號以表示它是雙元音的一部份，例如 [aɪ̯]。
雙元音的類型
雙元音依響度的變化可分為上升雙元音與下降雙元音（或稱上升複元音與下降複元音）。上升複元音以響度較低的元音開始，以響度較高的元音結束，例如 [ɪ̯a]。下降複元音以響度較高的元音開始，以響度較低的元音結束，例如 [aɪ̯]。在某些語言或研究中，會將下降複元音視為真正的雙元音，至於上升複元音則傾向於被當作相鄰出現的兩個元音。例如在漢語中，上升複元音常被當作介音與主要元音的結合，而下降複元音則被當作一個整體的押韻單位。
參見
- 音位變異
- 三元音
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