Johannes Mendlik (19 October 1935 – 16 November 2022) was a Dutch judge.
Mendlik studied law at Leiden University from 1955 to 1961. After his studies, he became a judicial officer in training in 1961 at the (nowadays merged into the Court of Zeeland-West-Brabant), where he held several other positions. He became a judge in 1970. In 1978 he became vice president of the court and from 1986 to 1994 he served as president. Afterwards he was president of the from 1994 to 2000. During his presidency there he was involved in modernizing the court and founding the .
Mendlik was an Officer of the Order of Orange-Nassau. When he was president of the Rotterdam court, he refused to be appointed knight in the same order, because he considered it inappropriate.
Mendlik was a grandson of the Hungarian-Dutch painter and his wife, the sculptor . He married to Christine van Heuven. Their daughter was president of the from 2016 to 2021 and president of the Rotterdam Court, like her father, since 2022.
Mendlik died in Bloemendaal on 16 November 2022, at the age of 87.