The Elliott 803 was a small computer manufactured by the British company Elliott Brothers in the 1960s. About 250 were built and most British universities and colleges bought one.
The 800 series started with the 801, a one-off test machine built in 1957. The 802 was a production model but only seven were sold between 1958 and 1961. The short-lived 803A was built in 1959 and first delivered in 1960; the 803B was built in 1960 and first delivered in 1961. Elliott subsequently developed the much faster Elliott 503 computer to be software compatible.
Over 200 Elliott 803 computers were delivered to customers, at a price of about £29,000 in 1960, the majority of sales being the 803B version (with more parallel paths internally, larger memory and hardware floating-point operations). In 2007, at least three working Elliott 803 computers survive. There is one in the Science Museum (London) and the Computer Conservation Society has two, one in London and one at The National Museum of Computing at Bletchley Park.