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The HP-71B was a hand-held computer or calculator programmable in BASIC, made by Hewlett-Packard from 1984 to 1989.

The HP-71B was known as the "supreme" hand-held calculator/computer of choice at the time for those seeking the ultimate in hand-held devices.

Smaller and less expensive (595 USD [1] MSRP) than the preceding model HP-75, the 71B had a single-line 22-character liquid crystal display, 64K system ROM and 17.5K user memory. It operated on four AAA batteries. Four plug-in ports permitted ROM-based programs or additional user memory to be added. Separate compartments could accommodate an optional magnetic card reader and an optional HP-IL interface (HP 82401A) that could be used to connect printers, storage and electronic test equipment.

The 71B was the first handheld to implement the IEEE floating-point standard. Programming features included a real-time clock, programmable timers and subroutine calls with parameter passing and recursion. It was also HP's first calculator based on the Saturn processor, later versions of which are found in the popular HP-48 series calculators and most more recent HP calculator models.