Marriage is a custom common to most races of two genders where two people, usually a man and a woman, are legally joined together for a lifetime in a ceremony called a wedding, with the possibility of a family being produced through the marriage. Marriages in the particular time period that most of the Smurfs stories are set in were usually arranged by the parents, though as depicted in the stories themselves, the characters usually marry out of love for each other. Heterosexual marriage is considered a virtue in Christianity with the intention that families may be produced and that the virtues of godliness would be instilled upon future generations.
There are some characters in the Smurfs cartoon series that are married. Selwyn and Tallulah are a married human couple of sorcerers that, despite their constant bickering and fighting, still show love for each other. In the cartoon special "Smurfily Ever After", Laconia the wood elf was joined to Woody through a ceremony held by the Smurfs which Gargamel had crashed with his ghoulish calliope. Bigmouth and Bignose are a couple of ogres that at some point during the cartoon series fell in love with each other and became married. In the cartoon show special "'Tis The Season To Be Smurfy", the Smurfs bring joy to an elderly human couple Gustav and Elise at a time when Elise was sick to the point where it would have been her last Christmas. In the "non-canonical" 2011 Smurfs movie, the Smurfs visit a modern-day human couple, Patrick and Grace Winslow, who are expecting their first child.
It is possible, despite the fact that the Smurfs are mostly depicted as a single-gendered race of males with a few magically-created female Smurfs, and with reproduction of new Smurfs done through non-physical means, that marriages can also take place in their culture. However, since Smurfette loves her fellow Smurfs to the point where she couldn't decide which one of them she will ever settle down with, and since very little is revealed about the nature of Grandpa Smurf's relationship with Nanny Smurf, this can only be speculated upon. Nonetheless, in the cartoon show episode "Papa's Wedding Day", Papa Smurf found himself falling in love with Flowerbell the woodnymph, who made him feel young again, and was intending to marry her until it was revealed that she was just using him so he could be captured by Lord Balthazar in exchange for her freedom.