Hendrik "Henk" Johan Lubert Vonhoff (22 June 1931 – 25 July 2010) was a Dutch politician of the People's Party for Freedom and Democracy (VVD) and teacher.

After the election of 1971 Vonhoff was appointed as State Secretary for Culture, Recreation and Social Work in the Cabinet Biesheuvel I, taking office on 28 July 1971.

After the election of 1972 Westerterp returned as a Member of the House of Representatives, taking office on 23 January 1973 but he was still serving in the cabinet and because of dualism customs in the constitutional convention of Dutch politics he couldn't serve a dual mandate he subsequently resigned as State Secretary for Culture, Recreation and Social Work on 23 April 1973 and he continued to serve in the House of Representatives as a frontbencher chairing the parliamentary committee for Education and Sciences and spokesperson for Education, Social Work and Culture.

Vonhoff also became active in the private sector and public sector and occupied numerous seats as a corporate director and nonprofit director on several boards of directors and supervisory boards (Groninger Museum, University Medical Center Groningen, Radio Netherlands Worldwide, Noordelijk Scheepvaartmuseum and the Royal Library) and served on several state commissions and councils on behalf of the government (Advisory Council for Spatial Planning, Raad voor Cultuur, Cadastre Agency, Hoge Veluwe National Park, Natuurbeschermingsraad, Institute for Sound and Vision and the Public Pension Funds PFZW) and worked as a trade association executive for the Beer and Mineral Water Manufacturers association (BBM) serving as chairman of the executive board from February 1977 until May 1992 and for the Techniek Nederland (MKB) serving as chairman of the executive board from August 1982 until October 1996 and as a sport administrator for the National Olympic Committee (NOC) serving as President of the Dutch Olympic Committee from 21 May 1985 until 27 January 1989.

Vonhoff continued to comment on political affairs until his is death at the age of 79 and holds the distinction as the longest-serving Queen's Commissioner of Groningen after World War II with 15 years, 198 days.