Marius Barnard (born 20 January 1969) is a retired South African tennis player, who delivers Executive Coaching to CEOs, MDs, Directors, and other business leaders.

He specialises in shifting mindsets, performance coaching, managing pressure, building self-belief, and utilising Positive Intelligence tools.

As a business and psychology graduate, he started coaching tennis players, cricketers, and golfers in 2002.

As a tennis professional, he was more successful in doubles on the ATP Tour and played in Grand Slams for more than a decade.

In his career, he won six titles on the ATP Tour, reached eight finals as well as the quarter-finals of Wimbledon and the Australian Open.