Double tilde (~~ or ≈) may refer to:

• Approximation ≈
• Double negation ~(~x)
• Smart match operator in Perl, ~~
• In PostgreSQL the operator ~~ is equivalent to LIKE
• In certain programming languages, ~ transforms a value into an integer and takes its complement, and so ~~ (sometimes called 'two tildes' to indicate a form of double negation) is a way to transform a value into an integer.
• U+0360 ◌◌͠ COMBINING DOUBLE TILDE , a tilde diacritic that spans a pair of adjacent characters: ◌͠◌
• ~~~, an EP by Ana Roxanne