There are many reasons to study another language – personal enrichment, learning about another culture, wanting to travel to another country armed with the ability to communicate with the local community. Below is a list of institutions that offer language courses:

Alliance Française de Singapour
Offers courses in French and French culture at all levels of fluency, from beginner to advanced and beyond.
www.alliancefrancaise.org.sg

A.T.T. Language Centre
Teaches English & Mandarin. No website available so no way of knowing what it's like before you call.
19 Tanglin Rd. #08-01
Tanglin Shopping Centre
Singapore 247909

Inlingua Singapore
Short part-time courses in English, French, German, Greek, Italian, Russian, Spanish, Dutch, Chinese, Japanese, Korean, Indonesian, Malay, Tamil, & Vietnamese
E-mail: info@inlingua.edu.sg
Website: http://www.inlingua.edu.sg
Tel: (65) 6235 5222

The British Institute in Singapore
Gives a variety of English language courses
30 Napier Road
Singapore 258509
Tel : ( 65) 6473 1111
Fax: (65) 6472 1010
E-mail: contact@britishcouncil.org.sg
Website: http://www.britishcouncil.org/

YMCA Singapore
Offers language enrichment programmes in English & Chinese
1 Orchard Road Singapore 238824
Tel: (65) 6336 6000
Fax: (65) 6336 8003
Website: http://www.ymca.org.sg

Goethe-Institut in Singapore
Offers German language courses
http://www.goethe.de/ins/sg/sin/lrn/deu/enindex.htm

Spring Language School
Teaches a variety of Asian and European languages, although not all are available for adults. However, adults can learn certain languages such as Chinese.
E-mail: courseinfo@spring.edu.sg
Website: http://www.springlanguage.com.sg/adultcos.htm

It may also be a good idea to call the embassies of the country whose language you're interested in learning to find out if they can recommend any schools/courses in Singapore .