D'

D' may resemble:
 * D' (D + apostrophe), the contracted form of words in several languages (for example, a French indefinite article); for a full list, see the Wiktionary entry
 * Dʼ (D + modifier apostrophe), Slavic notation for palatalised d
 * Ď, ď in lower case (D + caron), a letter of the Czech and Slovak alphabets
 * D′ (D + prime), used for example to represent the sensitivity index in statistics
 * Ḋ (D + overdot)
 * Dʻ (D + ʻokina)
 * Dʾ (D + right half ring)
 * Dʿ (D + left half ring)