Carl Gustaf Christer Pettersson (23 April 1947 – 29 September 2004) was a Swedish criminal who was a suspect in the 1986 assassination of Olof Palme, the Prime Minister of Sweden.

In 1988, Pettersson was detained and accused of Palme's murder after an investigation, which appeared to have started based on rumors about his involvement among fellow small-time criminals and drug addicts.

The initial investigation had uncovered little of significance, but once detained, Pettersson was picked out from a ten-person police lineup by Lisbet Palme.

The court cited a lack of evidence, including the missing murder weapon, and raised questions over the reliability of Lisbet Palme's identification.

Although Pettersson appears to have quickly spent the money on alcohol and drugs, he remained in the media spotlight and then raised his income by selling TV and newspaper interviews.

In 1998, the Swedish Supreme Court rejected a prosecutor's appeal to retry Pettersson by citing that the new evidence put before it was "not of such nature that a new trial can be granted in the case.