A Puisne Justice or Puisne Judge ( /ˈpjuːni/; French: puisné or puîné, "junior") is the title for a regular member of a Court. This is distinguished from the head of the Court who is known as the Chief Justice or Chief Judge. The term is used almost exclusively in common law jurisdictions such as England, Australia, Gibraltar, Kenya, Canada, Sri Lanka, India, and formerly in Hong Kong. Generally, the term is only used in relation to judges of a superior court, e.g., the Supreme Court or the High Court of a jurisdiction.

The equivalent term in the United States is Associate Justice.

The equivalent term in Scotland (which, although part of the UK, has a separate legal system) is Lord Ordinary.