Finding chapter books for second graders can be tough, because these kids are often new to reading and we don't want to discourage them with bulky chapter books. Ideally, these kids would be seven-year-olds. The selections for this age (unless you have a faster reader) tend to be heavily illustrated, featuring text in much larger fonts and simple story lines. If you're an adult reader, you could get through these books in under an hour or much less. Series are also a hit for this age group.
Just for reference, in the States, third graders are generally about eight years old. If you're fortunate, you may already have a big reader on your hands who isn't afraid to shoot for younger middle-grade titles like some of those on this list. Typically, though most eight-year-olds prefer smaller chapter books, under 150 pages, with lots of pictures and larger fonts than the typical middle-grade book. Kids at this age also like series -- they want to remain in the same universe for as long as possible, so most of the books on this list are part of series. These chapter books for third graders are good for independent reading and also for readalouds! All except one are heavily illustrated, and I've tried to include picks for a variety of interests.
Mindy Kim and the Yummy Seaweed Business is the first book in the Mindy Kim series. Mindy and her father have recently moved from the city to a suburb in Florida where she is the only Asian girl in her school. On top of that, Mindy's mom died shortly before their move and her dad is adjusting to being a single parent. Like any normal child, Mindy wants to be liked at her new school. She's fortunate to meet a new friend on her first day, even though the kids complain about the way her Korean lunch smells.