Le Tonnelier, Tonnelier, or Tonnellier is a French occupational surname. It literally means "cooper" in French. Notable people with the surname include:
- Le Tonnelier de Breteuil
- Achille Le Tonnelier de Breteuil
- Claude Le Tonnelier de Breteuil
- Gabrielle Émilie Le Tonnelier de Breteuil (1706–1749), mathematician, daughter of Louis Nicolas
- Henri Le Tonnelier de Breteuil
- François Victor Le Tonnelier de Breteuil (1686–1743), twice secretary of state for war
- Louis Auguste Le Tonnelier de Breteuil (1730–1807), diplomat and politician
- Louis Nicolas Le Tonnelier de Breteuil (1648–1728), officer of the household of Louis XIV
- David Tonnellier, Canadian curler
- Franz Tonnelier (1813–1881), Getrman landscape painter
- Hans-Joachim Tonnellier (born 1948), German banker
- Rodolphe Tonnellier (1887–1965), French politician
- Thierry Tonnelier (born1959) is a retired French middle-distance runner