2015, Frederick Wong Award, American Watercolour Society, New York, USA
(8th work to win AWS award – “Lane in Bhaktaphur”, Nepal)

2013, Master of ASEAN Award, the World Watercolour Exposition in June 2014, Thailand

2010
Winsor and Newton Award, American Watercolour Society, New York, USA
(7th work to win AWS award – “A Dusty Day in Kathmandu”, Nepal)
• Friend of Heritage Award, National Heritage Board, Singapore

2003, Silver Award, the organizing committee of the National Watercolour Exhibition of the People’s Republic of China, Fuzhou China

2001
• Supporter of the Arts Awards, the National Arts Council, Singapore
• The Singapore Internationale, the Singapore International Foundation
• Ida Wells Stroud Memorial Award, the American Watercolour Society
New York, USA (6th work to win AWS award – “Morning”)

2000
• Winsor & Newton Award, the American Watercolour Society, New York, USA (5th work to win AWS award - “Old Corner, Nepal”)
• Conferred the Dolphin Fellowship by American Watercolour Society. USA
(The American Watercolour Society is a non-profit membership organization that began in 1866 to promote the art of watercolour painting in America. Each year, the Society holds a juried exhibition of watercolours from artists throughout the world.)
(The Dolphin Fellowship was established to encourage artists to create more award-winning paintings and for the advancement of the art of watercolor. Unlike some fellowships where candidates have to be sponsored by other Fellows to achieve membership, membership in the Dolphin Fellowship is obtained by merit alone in accordance with the point system.)
• The Excellence for Singapore Award 2000, by the Singapore Totalisator Board on 4 August, 2000, Singapore. (Presented by Singaporean Ex-President, Dr. Wee Kim Wee)

1995
• Pingat APAD Award, by the Malay cultural group, Angkatan Pelukis Aneka Daya on 9th December 1995, Singapore (Ministry of Information & the Arts)

1992
• Barse Miller Memorial Award, the American Watercolour Society, New York, USA (4th work to win AWS award - “Gyantse Market”)
• Painting “Sentosa from Mt Faber and Raffles Hotel” selected for the ‘LOOK JTB’ travel magazine cover from 1992 to 1994, distributed in Tokyo, Osaka, Fukuoka, and Sapporo

1991
• ‘Ponnadai’ (Golden Shawl) Award, the Singapore Kai-Ralee Kala Nilayam (Singapore Kairalee Arts Centre) in recognition of artistic achievements to Singapore

1990
• Active member, American Watercolour Society (A.W.S) New York, U.S.A
• Awarded the 1990 Cultural Medallion, by the Ministry of Information and the Arts, Singapore (Highest accolade for the Arts in Singapore)

1989
• Clara Stroud Memorial Award, the American Watercolour Society,
New York, U.S.A (3rd work to win AWS Award - “Thimi, Nepal”)

1988
• Lucy B.Moore Memorial Award, the American Watercolour Society,
New York, U.S.A (2nd Work to win AWS Award – “Backyard, Singapore”)

1983
• Paul B. Remmy Memorial Award, the American Watercolour Society,
New York, U.S.A (1st work to win AWS Award – “Heart of Kathmandu”)

1982
• P.J. Ireland Award, Macquarie University, N.S.W Australia

1977
• Medal Award, National Art Exhibition, Ministry of Culture, Singapore

1974
• First Prize, Port of Singapore Authority Artists Encouragement Scheme Open Art Competition, Singapore

Exhibitions

2014
• Nostalgia in Transformation, Ode to Art, Singapore

2013
• Solo Exhibition with Quanhua Watercolour Art Gallery, Shanghai

2010
• Poems in Watercolour, Galerie Belvedere, The Arts House, Singapore

2008
• Home and Nation in the Art of Ong Kim Seng, Singapore Art Museum

2005
• Shanghai Land of Splendour - Shanghai Art Fair, Guangzhou Art Fair, Guangzhou Commodity Fair Exhibition, China

2004
• Moments of Light, Singapore Tyler Print Institute, Singapore

2003
• Mastering Light and Shade, National University of Singapore

2002
• Timeless Jiangnan- with Kwek leng Joo, Singapore

2000
• Recent works of Ong Kim Seng, Singapore History Museum

Collections

• Queen Elizabeth II of England
• The Prime Minister of the People’s Republic of China
• The Secretary-General of the United Nations
• President of the Republic of Korea
• Prime Minister of the Kingdom of Thailand
• The President of the Republic of the Philippines
• The Prime Minister of Japan
• The Prime Minister of India
• The Governor of Hokkaido
• Singapore Arts Museum
• Singapore Maritime Museum
• The Agung Rai Museum and Neka Museum in Bali, Indonesia
• The Ministry of Foreign Affairs Headquarters, Foreign Missions and Embassies of the Republic of Singapore