Tobias Tuvia Lewenstein (Hebrew: טוביה לבנשטיין; 1863–1952) was Chief Rabbi of Jewish communities in the Netherlands, Denmark, and Switzerland in the late 19th and early 20th centuries.

[1] After his father's death in 1864, Lewenstein's family returned to Leiden in the Netherlands to live with his mother's sister and uncle.

[3][4] On 1 May 1903, he was selected by Copenhagen's Community of the Mosaic Faith [da] to succeed David Simonsen as chief rabbi of Denmark.

His term there was contentious due to his opposition to interfaith marriage, allowing children born of Jewish fathers and non-Jewish mothers to convert, and participation in a Danish ecumenical national day of prayer, among other issues, and he was removed from the post on 18 January 1910.

Because Lewenstein's contract stated the position was a lifetime appointment, his dismissal sparked a legal battle that ended up before the Danish Supreme Court.