After St James's Gate, Shamrock Rovers, Bohemians, Shelbourne and Dundalk, Dolphin became the sixth club to win the League of Ireland title.

The following season a Dolphin reserve team would win a second Leinster Senior League title for the club.

In the 1931–32 FAI Cup final, with a team that included Larry Doyle, Jeremiah Robinson, Alex Stevenson, Jimmy Shiels and Johnny Somers, Dolphin played Shamrock Rovers.

This time the Dolphin team included George Lennox, Larry Doyle, Joe Kendrick, Jimmy Bermingham, Johnny Somers and Willie Fallon.

On 3 March 1933 at Dalymount Park, a crowd of 32,000 witnessed a game which produced six goals, including three penalties, and finished 3–3.

Dolphin enjoyed their most successful season in 1934–35, when they won both the League of Ireland title and the Dublin City Cup.

They scored 56 of their team's 66 goals between them that season and were largely responsible for Dolphin finishing as League of Ireland runners-up.

Alex Stevenson, Joe Kendrick, Jeremiah Robinson, Larry Doyle and George Lennox all won international caps while playing for Dolphin.