Johanna Jantina "Hanneke" van der Werf (pronounced [ˈɦɑnəkə vɑn dər ˈʋɛr(ə)f]; born 29 November 1984) is a Dutch politician of the Democrats 66 (D66).

[9] Van der Werf ran as a candidate in the 2014 municipal election in The Hague, appearing seventh on D66's party list.

[1] In September 2018, Van der Werf stopped working for the D66 caucus in the House of Representatives to take a job at financial services company Aegon as a spokesperson for mortgages, damage and innovation.

[8][16] As council member, she wanted The Hague to apply for a pilot to test the legal cultivation and distribution of cannabis, but it was not supported by enough parties.

[24][25] An amendment by Van der Werf was later passed to make revenge porn a sex crime, having before been classified as a privacy infringement.

The document called on society, employers, and the government to act, and it was signed by most parties in parliament as well as several professional associations and labor unions.

[30] Van der Werf returned on 29 March 2024 following her re-election in November 2023, and her specialties changed to defense, security, sex crimes, digital affairs, pensions, and benefits.

[31][32] Along with Barbara Kathmann (Labour Party), she advocated for an age rating system for social media platforms to protect children against negative effects.