Science of Happiness, a free online course out of Berkley, offered twice a year, every year since 2014, by The Greater Good Center. (Highly recommended.)
Kripalu Center also offers one.
USC has a Science of Happiness course, or at least had it in the Spring of 2009, 2011, 2013, 2015, Psychology 201 (4 units).
The Science of Well-Being, Yale, instructor Laurie Santos | Free online, via Coursera (Highly recommended)
Happiness and Culture 