Rennell is a family name which has also been used geographically and may refer to:
- People
- Baron Rennell
- Rennell Rodd, 1st Baron Rennell (1858 – 1941), British diplomat, poet and politician
- Francis Rodd, 2nd Baron Rennell (1895 – 1978), British army officer and diplomat
- Tremayne Rodd, 3rd Baron Rennell (1935 – 2006), Scottish rugby union player
- James Rennell (1742 – 1830), British geographer and pioneer oceanographer
- Paul Rennell, New Zealand soccer player
- Thomas Rennell (1754–1840), British clergyman
- Thomas Rennell (scholar) (1787–1824), British theologian and author
- Places
- Rennell Island, Solomon Islands
- Rennell and Bellona Province
- Rennell Glacier, Antarctica
- Rennell Sound, Canada
- North Rennell Island, Chile
- South Rennell Island, Chile
- Animals
- Rennell Fantail
- Rennell Flying Fox
- Rennell Shrikebill
- Rennell Starling
- Rennell Island Monitor
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