Tideline in oceanography is where two currents in the ocean converge.
Tideline or Tidelines may also refer to:
Tideline (novel), a 2012 novel by Penny Hancock Tideline (film), a Canadian-French drama film "Tideline" (short story), a short story by Elizabeth Bear Tide Lines, a Scottish folk band featuring music from Scottish West Highlands and Islands Tideline Ocean Resort & Spa in Palm Beach, Florida, a luxury Kimpton Hotel, formerly named Omphoy Ocean Resort
See also Tide-Line Blue, a Japanese anime series