On 27 June 2007, to commemorate 40 years of currency agreement with Brunei, a commemorative S$20 note was launched; the back is identical to the Bruneian $20 note launched simultaneously. A circulation version of the $20 note can be exchanged at banks in Singapore beginning 16 July 2007, limited to two pieces per transaction.
On 18 August 2015, to commemorate Singapore's 50 years of nation-building, the Monetary Authority of Singapore launched a set of six commemorative notes. These commemorative notes comprise five S$10 polymer notes and a S$50 note. The note design's draw inspiration from significant milestones and achievements in Singapore's history, the multiracialism that defines the nation and the values and aspirations that underpin Singapore's progress. The front of both the $50 and $10 notes feature a portrait of Yusof Ishak, Singapore's first president, as in the current Portrait series notes.  The $50 note highlights Singapore's history, transformation and future. It shows the late Prime Minister of Singapore, Lee Kuan Yew, shouting "Merdeka!"—the rallying cry of Singapore's independence struggle. The note makes distinctive use of the colour gold, reflecting Singapore's Golden Jubilee. The five $10 notes have a common front design and varying back designs depicting the theme 'Vibrant Nation, Endearing Home'. Each note reflects a value or aspiration that defines the theme: 'Caring Community, Active Citizenry', 'Opportunities for All', 'Safe and Secure', 'Strong Families' and '...regardless of race, language or religion...'.
In 2017, to commemorate the 50th anniversary of its Currency Interchangeability Agreement between Brunei and Singapore, both the Monetary Authority of Brunei Darussalam and the Monetary Authority of Singapore issued $50 polymer banknotes to commemorate that event.
On 5 June 2019, a $20 note commemorating the Singapore Bicentennial was issued.
|Singapore commemorative banknotes|
|Image||Value||Dimensions||Main Colour||Occasion||Description||Date of issue||Material||Ref.|
|$50||156 × 74 mm||Red||25th Anniversary of the Independence of Singapore||Optically variable device shows President Yusof bin Ishak, Singapore Harbour in 1861, four blossoms of the "Vanda Miss Joaquim" orchid, Tanjong Pagar container port and some prominent office buildings||1st Parliament of Singapore held on 8 December 1965 and group of multi-racial Singaporeans in jubilant celebration||24 July 1990||Polymer|||
|$25||141 × 79 mm||Brown||25th Anniversary of the Monetary Authority of Singapore||Monetary Authority of Singapore Building set against a view of Singapore's financial district and scene of the SIMEX trading floor||Singapore's financial sector skyline||10 May 1996||Paper|||
|$20||149 × 72 mm||Orange||40 Years of the Currency Interchangeability Agreement||President Yusof bin Ishak and the "Dendrobium Puan Noor Aishah" orchid||The Esplanade, skyline of Singapore's financial district and the Omar Ali Saifuddien Mosque with the Royal Barge and the water village shown||27 June 2007||Polymer|||
|$50||156 × 74 mm||Gold||SG50: Celebrating Singapore's 50 years of nation-building||President Yusof bin Ishak, Prime Minister Lee Kuan Yew and a group of children of different races and gender||First National Day Parade 1966 and the Punggol New Town||11 August 2015||Polymer|||
|$10||141 × 69 mm||Red||President Yusof bin Ishak and the "Vanda Miss Joaquim" orchid||"…regardless of race, language or religion…"||11 August 2015||Polymer|||
|$10||141 × 69 mm||Red||"Opportunities for All"||11 August 2015||Polymer|||
|$10||141 × 69 mm||Red||"Safe and Secure"||11 August 2015||Polymer|||
|$10||141 × 69 mm||Red||"Strong Families"||11 August 2015||Polymer||<|
Commemorative banknotes are also released, usually in limited quantities. The first commemorative banknote was released on 24 July 1990 to celebrate the 25th anniversary of Singapore's independence. Of the 5.1 million $50 polymer banknotes issued, 300,000 came with an overprint of the anniversary date "9 August 1990". This $50 note was the first commemorative note issued by the Board of Commissioners of Currency, Singapore (BCCS) and was also the first polymer banknote in the history of Singapore's currency. In addition, the $50 note was the first note designed in Singapore by a Singapore artist.
On 8 December 1999, to celebrate the coming 2000 millennium, three million $2 millennium notes were circulated. The note is similar to the $2 portrait series, except that the prefix of the serial number is replaced with a Millennium 2000 logo. These millennium notes are printed on paper as polymer notes were not introduced yet then.