Eastern Suburbs (now known as the Sydney Roosters) competed in the 14th New South Wales Rugby League (NSWRL) premiership in 1921.^[1]

• Home Ground: Agricultural Ground
• Line ups:-

In 1921 there was only one round of matches played!^{[citation needed]}

• Premiership Round 1, bye.
• Premiership Round 2, Saturday 30 April 1921;

Eastern Suburbs 32( 6 Tries; 7 Goals) defeated South Sydney 8( Funnell, McGrath Tries; Oxford Goal) at the Sydney Cricket Ground.

• Premiership Round 3, Saturday 7 May 1921;

Eastern Suburbs 30 (Tries 6; Goals 6) defeated Newtown 5(Try; Goal) at Sydney Cricket Ground.

This was reported to be a particularly wild match, reporter for the Sun newspaper, Claude Corbett, wrote "The first half was one of the wildest exhibitions of football I have ever seen. Newtown was solely responsible. There were times when a dozen players were tossing about in a heap, tearing and reefing at each other. Fists and feet flew on occasions and it was a miracle that no one was hurt.

• Premiership Round 4, Saturday 14 May 1921;

Eastern Suburbs 23( Tries 5; Goals 4) defeated St George 11(Try; Goals 3; Field Goal) at the Sydney Cricket Ground No.2.

This was the first meeting of the two clubs.

• Premiership Round 5, Saturday 21 May;

Eastern Suburbs 8( Norman 4 Goals) drew with North Sydney 8( Blinkhorn, Green Tries; Thompson Goal) at Sydney Cricket Ground.

Described as the match of the season, Premiers, North Sydney, and eventual runners up Eastern Suburbs drew their match 8-all. The win, with no final played that year, virtually assured Norths of their 1st premiership. The official attendance was 44,818, but thousands more scaled the surrounding fences and walls - It was the largest crowd seen at a club match and remained so until the 1940s. A last gasp try by North’s George Green, just as Easts forward Jack 'Bluey' Watkins nailed him right on the corner flag, secured the draw for Norths.

• Premiership Round 6, Saturday 28 May 1921;

Balmain 14(Tries 2; Goals 4) defeated Eastern Suburbs 8(Tries 2; Goal) at Sydney Sports Ground.

• Premiership Round 7, ??? 11 June;

Eastern Suburbs 19 (Tries 5; Goals 2) defeated Glebe 3(Tries) at the Sydney Cricket Ground.

• Premiership Round 8, ??? 18 June;

Eastern Suburbs 55(Rex Norman 3, + 10 Tries; Rex Norman 8 Goals) defeated University 11 (Tries 3; Goal) at the Sydney Cricket Ground.

• Premiership Round 9, Saturday 25 June 1921;

Eastern Suburbs 12( Tries 2; Goals 3) defeated Western Suburbs 7( Try; Goals 2) at Pratten Park.

• Eastern Suburbs were defeated by South Sydney 21-10 in the final of that year's City Cup.
• Rex Norman Was the New South Wales Rugby League's leading pointscorer.
• Gordon Wright was the New South Wales Rugby League's leading try scorer for the 3rd year running.
• Sid 'Sandy' Pearce, the last remaining member of Eastern suburbs original 1908 team, retired after breaking his leg on that year's 'Kangaroo Tour'.
• Representatives: Rex Norman(NSW), Bill Ives(NSW), Ed Rigney(NSW), Sid 'Sandy' Pearce (Australia)