Five-eighth or Stand-off is one of the positions in a rugby league football team. Wearing jersey number 6, this player is one of the two half backs in a team, partnering the scrum-half. Sometimes known as the pivot or second receiver, in a traditional attacking 'back-line' (No. 1-7) play, the five-eighth would receive the ball from the scrum half, who is the first receiver of the ball from the dummy-half or hooker following a tackle.

The role of the five-eighth is often to pass the ball away from the congested area around the tackle, further out along the 'back-line' to the outside backs, the centres and wingers, who have more space to run with it. Furthermore, players in this position typically assume responsibility for kicking the ball for field position in general play. The five-eighth is therefore considered one of the most important positions, often referred to as a 'play maker', assuming a decision-making role on the field. Over time, however, as the game has evolved, the roles of the two halves have grown more aligned and difficult to distinguish. Along with other key positions – fullback, hooker and scrum half – the five-eighth makes up what is known as a team's spine.

One book published in 1996 stated that in senior rugby league, the five-eighth and hooker handled the ball more often than any other positions.

The Rugby League International Federation's Laws of the Game state that the "Stand-off half or Five-eighth" is to be numbered 6. However, traditionally players' jersey numbers have varied, and in the modern Super League, each squad's players are assigned individual numbers regardless of position.