Pieter J.J. van Thiel (1928–2012) was a Dutch art historian known mostly as one of the founders of the Rembrandt Research Project.

From 1964-1991 he was director of the department of paintings at the Rijksmuseum Amsterdam, where he took over from Bob Haak. He wrote the 1976 catalogue "All the Paintings of the Rijksmuseum in Amsterdam" (a supplement was published in 1992), which was finished the same year that The Night Watch was restored. It was during that major restoration project that he was co-author of the first three volumes of the Corpus of Rembrandt paintings. He was a co-founder of the Rembrandt Research Project in 1968, which he left just after retirement in 1993. He was a cataloguer and a major writer of the RRP and contributed to what was published in three volumes as A Corpus of Rembrandt Paintings between 1982 and 1989.

• First three catalogues of the Rembrandt Research Project
• All the Paintings of the Rijksmuseum in Amsterdam, 1976 (a supplement was published in 1992)
• Framing in the Golden Age : picture and frame in 17th-century Holland, 1995
• Rembrandt, de meester en zijn werkplaats, 1991
• Cornelis Cornelisz. van Haarlem 1562-1638, a monograph and catalogue raisonné, 1999
• 100 Hollandse schilderijen = 100 Dutch paintings = 100 tableaux Hollandais = 100 Holländische Gemälde, a selection of 100 top paintings of the Rijksmuseum (1972 tourguide)
• 100 Gouden Herinneringen = 100 Golden Memories = 100 Souvenirs d'Or = 100 Goldene Errinerungen, a selection of 100 top paintings of the Rijksmuseum (1992 tourguide)