Pablo Ziegler (born September 2, 1944) is a Grammy Awards winning Argentine composer, pianist, arranger based in New York City. He is an exponent of nuevo tango, and has worked extensively as Ástor Piazzolla's regular pianist from 1978 until Piazzolla's retirement for health reasons in 1989. During their collaboration, they performed with Milva, Placido Domingo, Gary Burton among others. He played with Piazzolla's re-formed Conjunto 9 in 1983 for his Teatro Colón concert with the Buenos Aires Philharmonic. In 1985 Ziegler composed the music for the film Adios Roberto, and in 1990, he established the New Tango Quartet.

His playing style, both sharply percussive and metallically lyrical, bears some similarities to that of Vladimir Horowitz as well as some of the wistfulness of Bill Evans. As a composer he has taken Piazzolla's contrapuntal approach to tango music and added more jazz influence, notably with the regular use of a drum kit, lighter harmonies similar to those used in bossa nova, and extended passages of improvisation. His 2003 album Bajo Cero received a Latin Grammy award.

He has worked with of classical, jazz, and Latin musicians including Emmanuel Ax, Gary Burton, Regina Carter, Branford Marsalis, Paquito D’Rivera, Kenny Garrett, Stefon Harris, Joe Lovano, Christopher O'Riley, Quique Sinesi, Walter Castro, Nestor Torres, Joe Locke, Randy Brecker, David Sánchez (musician), and Miguel Zenón.

He orchestrates and collaborates with orchestras as a soloist that include BBC Proms, Orchestre National de Lyon, Orpheus Chamber Orchestra, Metropole Orkest, Sydney Symphony Orchestra, Presidential Symphony Orchestra, Seoul Philharmonic Orchestra, Slovenian Philharmonic Orchestra and the Wellington Chamber Orchestra, with whom he performed in New Zealand in June 2014.