Robert Cain (born 13 February 1866) was a Scottish footballer who played as a full back for a number of clubs, primarily in England.

[1] Making his Football League debut for the club in November 1889 he played a number of games during the rest of the season before joining nearby Bootle in the summer of 1890.

Described as 'a big man', though he only took a size five boot,[1] the local media claimed that his game was 'strength personified' and that he 'kicked brilliantly without a semblance of effort' and 'tackled shrewdly and generally fairly'.

[1][2] With Sheffield United having been crowned Division One champions in the 1897–98 season, and shortly after receiving a benefit match, Cain opted to sign for Tottenham Hotspur in the summer of 1898.

[3] The move was to prove an unhappy one for Cain; unable to settle in London he quickly contacted Sheffield United to enquire whether he could return to the club but his request was rejected by the committee, still angry about his previous actions.